Planetside 2's tablet offering is quite impressive. A MWO app to keep up with what's happening in the persistent world and allow easy comms with other players would be great!
I love the idea, I have an android myself, however I would like the devs to focus on the game. If they have the in house talent to do an app, making one that gives you feeds like news and patch notes would be nice. Adding the mechlab sounds a bit more intense if you want it to be GUI. If you just want a simple lab that allows you to play with in game configurations, that might be easier for them to do. Anyway, great idea and one that will get a lot of attention from the active community.