If people knew about an exploit for a game and were willing to post about it, it'd be posted about. If not then either nobody knows of one, or somebody does know but isn't telling so that the game doesn't get pulled ahead of time.
No idea when. If you want things like this faster, then help. Learn to program and such, then join the wololo forums and check out the dev sections and junk.
As for GBA, VHBL should allow one of the emulators to run. Nothing without a hack though.