Sounds awesome, I cant wait for buried PS3. The easter eggs on die rise and tranzit are pretty fast and easy if you have done them before, so i wont be too pissed when I do Rictofen easter egg for buried then press the button, go for a high round in one uber 4 gun fire sale killing spree.
Then do it all Maxis.
The downall is for players without good friend lists, that cant go back and do all the easter eggs in an afternoon. Cuz from what im hearing, all 4 players have to do all 3 easter eggs first to achieve either sides final audio easter eggs and reward.