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Probably coincidence, but I got my first and only evolution item from my 7-day streak Pokestop spin. 100+ spins before that came up empty.

 

I got one last night. But also got one on my 7-day streak this morning.

 

Got a metal coat from 7 day spin

I got my Sun Stone on my 7 day spin this morning too. Havent found an evo item since. Increased chance on 7 day streak spins? Or just plain luck?

 

I got an upgrade with my 7 day streak this morning. It may be that we're guaranteed an evolution item at each 7 day streak but you can also get them randomly at pokestops.

 

I also got my sunstone today at my 7th day streak. My friend got a dragonscale in his first spin of the day( normal streak).

 

7th day spin for me this morning too, I got an Up-Grade

 

I just spun for my 7th day streak - got Upgrade. Prior to that, I had to spin pokestops for almost 8 hours before I received a King's Rock.

I spun over 400 yesterday to get my first sun stone. this took 5 hours of downtown grinding.

 

I spun over 100 today as well as yesterday and nothing so far. Not even for my 6 day spin.

 

About 250 spins today, got a Sun Stone from a random spin.

 

Meanwhile I'm on spin 175 for today and still not a single evolution item.

300 for me, none yet.

 

100~ got 1 King's Rock

 

200+ nothing. I did get a king stone from my 7 day streak reward.

 

Within my first 4 in the way to the station this morning, i received a Sun stone. Nothing since.

13 nanab berries and 6 pinap berries from probably 200 pokestop spins. No evolution items.

 

Got an upgrade after maybe 50 odd spins?

 

None after +100 spins

 

I received a dragon scale this morning on my 7th day streak pokestop. In the U.K. near Reading.

 

My son got Up-grade on first spin of the day today (not 7-day). Maryland, USA.

 

Spun roughly 500 Pokestops since Gen2 launched. Zero evolution items thus far but the drop rate on Pinap/Nanab is fairly good.

Probably coincidence, but I got my first and only evolution item from my 7-day streak Pokestop spin. 100+ spins before that came up empty.

I got one last night. But also got one on my 7-day streak this morning.

Got a metal coat from 7 day spin

I got my Sun Stone on my 7 day spin this morning too. Havent found an evo item since. Increased chance on 7 day streak spins? Or just plain luck?

I got an upgrade with my 7 day streak this morning. It may be that we're guaranteed an evolution item at each 7 day streak but you can also get them randomly at pokestops.

I also got my sunstone today at my 7th day streak. My friend got a dragonscale in his first spin of the day( normal streak).

7th day spin for me this morning too, I got an Up-Grade

I just spun for my 7th day streak - got Upgrade. Prior to that, I had to spin pokestops for almost 8 hours before I received a King's Rock.

I spun over 400 yesterday to get my first sun stone. this took 5 hours of downtown grinding.

I spun over 100 today as well as yesterday and nothing so far. Not even for my 6 day spin.

About 250 spins today, got a Sun Stone from a random spin.

Meanwhile I'm on spin 175 for today and still not a single evolution item.

300 for me, none yet.

100~ got 1 King's Rock

200+ nothing. I did get a king stone from my 7 day streak reward.

Within my first 4 in the way to the station this morning, i received a Sun stone. Nothing since.

13 nanab berries and 6 pinap berries from probably 200 pokestop spins. No evolution items.

Got an upgrade after maybe 50 odd spins?

None after +100 spins

I received a dragon scale this morning on my 7th day streak pokestop. In the U.K. near Reading.

My son got Up-grade on first spin of the day today (not 7-day). Maryland, USA.

Spun roughly 500 Pokestops since Gen2 launched. Zero evolution items thus far but the drop rate on Pinap/Nanab is fairly good.

tl;dr: While no concrete numbers have been confirmed yet, as these items have only been out for roughly a day at this point, it seems very safe to say that the odds of finding one from a PokéStop are very slim. Based on the reports I've been reading, it looks like the odds to receive one are at or around 1%, possibly lower. In fact, from this report, the calculated probability of receiving an evolutionary item seems to be roughly 0.14%, as a grand total of 33 evolutionary items were received among over 24,000 drops.

One comment linked to this thread which originally speculated that these items only came from 7th day streak spins (this has since been disproven numerous times, though the frequency which it appears to happen seems to indicate that you have a higher chance of finding one on these spins):

tl;dr: While no concrete numbers have been confirmed yet, the odds of finding one from a PokéStop are very slim. Based on the reports I've been reading, it looks like the odds to receive one are at or around 1%, possibly lower. In fact, from this report, the calculated probability of receiving an evolutionary item seems to be roughly 0.14%, as a grand total of 33 evolutionary items were received among over 24,000 drops.

One comment linked to this thread which originally speculated that these items only came from 7th day streak spins (this has since been disproven numerous times, though it has now been confirmed that you are guaranteed an evolutionary item for this):

However, it's worth noting that it seems like your chances of getting an evolutionary item is higher when spinning your 7th day streak PokéStop, though all evidence is anecdotal at this point. From personal experience, my 7th day spin has been the only time I've received an evolutionary item from a PokéStop so far.

However, it's worth noting that it seems like you are now guaranteed to get an evolutionary item when spinning your 7th day streak PokéStop, according to this in-game notification: