If you don't need your projector until late September - early October, I'd say it makes sense to wait. I assume that the 50ES will take the place of the 30ES (maybe even at that price point), with the 55ES taking the role currently occupied by the 50ES.
Motorized zoom doesn't seem like a big must-have to me, while Wireless HDMI is only going to add to the price tag. The big unknown is whether the 55ES will get the lens of the VW95 and if so, whether that will drive a price increase.
From my research I identified the following weaknesses of the HW50ES:
1. 3D Flicker (240Hz).
2. IR based 3-D solution.
3. Lens could do with some improvement.
I have yet to hear anything that would suggest items 1 & 2 are being addressed, and item #3 is an unknown and if addressed could come with a jump in price.