For the pre-order, was that done recently or around the time of the original Kickstarter? My understanding is that pre-orders after the original print run are actual from a "reprint" (new print run) and Tim has been stating that they wouldn't ship until November (now).
I hadn't heard about an expansion, but 'Fugitive' is coming out soon, which is sort of a sequel.
Fugitive sounds like a fine and fun game, but I'm definitely more excited for an expansion here. Good heist themed cooperative games are thin on the ground.
Just adding my $0.25 in the hopes Tim makes this a reality.
There was also some talk in the twittersphere that Tim is playing around with some early ideas for Burgle Bros Legacy. So I'm thinking there's gonna be some more fun BB stuff coming out in the future regardless.