Okay, slimes will now spawn in swamp biomes. Nowhere really said if they had any other requirements beyond low light (>8 (which if I remember correctly, is math for less than eight) )
I built an 8x8 pad 5 blocks down from the skycap in a swamp, verified with f3. It had zero light and enough space for any size to spawn (enough for all but large slimes at the very least). All I had a show up few Endermen. No slimes did.
Any thoughts or ideas? Or better yet any code miners have a great tidbit that I am missing?
I'm using vanilla Minecraft 1.6 prerelease in survival mode without cheats.
P.S. My whole goal is to not have to track down a mythical "slime chunk", but if it should come to that, I already know how, thanks though.