IGN writes: The first wave of Skyrim: Dawnguard beta invites are going out, with Bethesda labelling the number of applications "overwhelming".
(PC, PS3, The Elder Scrolls V: Skyrim, Xbox 360)
considering the difficulty the ps3 had with the base game, i can seen why the developer decided to not include the ps3 on this beta. I'm sure they will eventually get the dlc though.