I'm really thrilled to hear this...
I'm a big LEGO fan and have quite some Star Wars sets. I've always wondered whether LEGO and Lucasfilm would one day expand their partnership with an Indy line. Sure hope it'll turn out true.
In fact, there has already been a heavily Indy based 'LEGO Adventurers' line from 1998 to 2003, starring a minifigure called Johnny Thunder. Even a small kid could see that Thunder was actually just Indiana with a moustache
Check Johnny out and see for yourself:
I've gathered from a few LEGO forums that most of the LEGO fans aren't too thrilled with this recent rumor. They see the coming of an Indy LEGO line as a threat that could kill of the possibility of a continuation of their beloved Johnny Thunder line. They would actually prefer an expansion of the Johnny line instead of the real thing.
Not me though
Also, a lot of LEGO fans are wondering how LEGO would deal with the Nazi swastika symbol in case the line would include sets based on the old Indy movies. I admit that that might be a problem. Imagine little kids sticking their spare swastika stickers from the LEGO zeppelin on school equipment or something. That would indeed raise some eyebrows...
Still, it's not neccesarily unsolvable. They could just replace the swastika with a simple cross, like Factor 5 did thirteen years ago in their Indiana Jones' Greatest Adventures game.
Anyway... Long story short, I would love to see a Indy LEGO line. If successful ( and I have no doubt that it will be), it might turn out to be the largest Indy toyline in history. Sure hope so.