Hideeho
I won't guess at a time frame, other than before 2015 1/10 worlds

, but I expect a new AE 4wd is coming. My guesses as to what will be different:
AL chassis, maybe offered in 2 lengths
beefed up arms (2 cars crashing out of worlds with broken arms

)
new motor mount (only because the current one sucks so bad

)
gear difs with ball difs as an option
metal ring & pinion gears on the difs
maybe using a shorty pack (see the new schelle racing chassis or the team c tm4 or the hpi d418)
the geometry will probably remain the same, but the way everything goes together will be tweaked to make it simpler & easier to work on (ball studs for the camber links in particular as well as to make it easier to get to the difs)
metric hardware (assuming it is a new platform not a .3)
The big question is going to be what they call it, assuming it is a new platform. b45? b54? b55?