Yes, 2012 is a guess on my part. I'm figuring 2011 for Transformers 3 with Transformers 2 coming out next June. Whether or not they'd wait for Shia to finish them I'm not sure, just what I've heard. I don't see why they wouldn't be able to shoot them in between Transformers though and have Indy in 2010, and the last one in 2012. Maybe that's what they meant, but from what I read it sounded like they would wait until he was done with both before doing more Indy.
So, if you work for Paramount is there anyway you can get some promotional stuff for Transformers? My wife would die to have it. Especially the press kit (she so wants the transforming pen). We were able to snag the box at an auction at Botcon this year, but that's all.