They ARE doing Indy,they hinted at it by having Indy a usable charcter in the Complete Saga video game t:
And I was reading in a magazine (I belive GameInformer, but not sure) and they actually had an article on LEGO Batman! They included points that it is going to be similar yet different than LEGO Star Wars, 2 player action with a main story arc and humurous LEGO-themed comedy. The difference is an unlockable villain mode where, not only can you be a villain like Star Wars games, you actually have a "story" line for villains only.
The whole premise is Batman and Robin putting villains back in jail after a breakout, and the villain story is you got to break out of Arkham and cause havoc.
Last but not least, a LEGO MMO is in the works, so I can't wait for that either!!!!!!!!