1 ) Yes.
2 ) Per this thread, you want Mini-European card sleeves (I use Gamegenic's, Amazon will have them as should almost any FLGS) and the Ultra-Pro Mini-American 16-up card pages (if you're so inclined):
http://forums.sjgames.com/showthread...sleeves&page=4
3 ) Due to larger market conditions in the game industry, slow-dripping expansion releases over time is not a really viable product strategy these days. The current product line basically dumped 5+ years of scheduled expansions all at once at launch. The two major announced products in current development are the companion book, which is more about optional rules and scenarios, and the motorcycles expansion, both of which will see an eventual crowdfunding campaign. Nothing involving further equipment cards is currently announced. [Motorcycles is still in early development, and while they are attempting to have all or most current equipment cards be usable on bikes, nothing is promised, let alone set in stone at the moment. It will probably involve new equipment cards either way though.]
This assumes, of course, that you have all four car miniature sets, the armory pack, the crew pack, the dropped weapons pack, etc. If you don't, then that's your next step:
https://carwars.sjgames.com/products/expansions/
Somewhere on my long list of upcoming CW-related programming projects is a Weapons Lab that will let you select dice and game effects, then use a tuned machine learning model to ballpark a build-points cost for it. I'll get to it eventually.