Recently, I received an email from Blizzard offering me to pre-purchase Heart of the Swarm expansion to StarCraft 2: Wings of Liberty. Is there any benefit to pre-purchasing as opposed to buying it after it's released?
I was wandering around Arqade Meta and found this:
This is currently the case for Starcraft 2 HOTS. Everybody can preorder on Amazon and get a free Beta key.
From my own experience, if you buy/upgrade a digital version through battle.net you can immediately download the beta client and start playing as per this link: https://eu.battle.net/support/en/blog/6816949
As far as I know, the beta is open until March 1st.