If you're looking in the sub-$1000 bracket, it doesn't make sense to wait.
BenQ have already announced their upcoming successors: the W1070+ and W1080+; neither are a very significant step up from their predecessors (except in price).
Optoma have already revealed two main entries in their upcoming budget lineup - the HD50 (which mainly treads on ground already covered by the W1070+; and is likely to be more expensive); and the HD26 (which mainly treads on ground covered by their existing HD25e/HD131Xe models).
Pushing the budget (much) higher yields Sony's first entry into the sub-$3000 bracket - which is their HW40ES ($2,500). It's just been released, which makes it unlikely they'll offer much else in that bracket come CEDIA.
If your budget stretches to $2000 (and not to the $2500 of the Sony) - then perhaps it makes sense to wait since we've yet to hear from some of the players in that price range.
But broadly speaking, in technology if you spend your time waiting for the next big thing, you'll wait forever.
BenQ W1070 Projector; Xtreamer Ultra 2 (running XBMC on OpenELEC) via Sony STR-DH540 AVR with Boston Acoustics SoundWare XS SE 5.1 Audio. MediaBrowser3 for Mobile Streaming.
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