Does anybody remember how many months prior before the release of the game both beta's occurred? this may give us some sort of direction if their is a beta going by those guidelines. Also I almost 70% sure AC3 will have MP beta, because PS3 has this speacial connection with AC series, just like how COD xbox will get DLC first, when game companies and console companies have those connection usally they get things first and get speacial thing's and so far MP beta has become a tradtion for ps3 owners, and it assumes that Sony get's an advantage on the competition so I think this will continue to manifest as usual, Unless they really have some big suprises and want to hold out this time, but by watching the MP preview unless they have some awesome maps I do not see anything to speacial to hide. Which I am not saying more features aren't going to come but not toe xtreme either.
I would guess that as well. Also it's almost an automatic that the beta will be on ps3 if there is one. It might be on the other consoles as well however if you've been paying attention ps3 has gotten exclusives on the Assassin's Creed series since ACB. ACB, ACR, and AC3 all have a little extra content on them on the ps3 and both ACB and ACR were exclusive betas to the ps3 audience only.