We are still a ways off till having a 4g LTE Android on verizon.
The earliest I would expect one is Feb '11. Not trying to be pessimistic just feel its more certain then not.
Also I wouldn't hesitate buying any new Android device now because you expect something greater later on.
I've said it before but will say again " you only live in the now". I've switched from a droid to a Inc to a soon to be Samsung Facinate all at no cost. I cleverly played the secondary retail market to get top dollar for my "old phones". Putting off purchases is futile if you have to wait more then 4-5 months to get a device.
There will always be superior devices on the horizon. You can only enjoy whats out there at the current time. Even if you wait for a hypothetical 4g Android device with 1080 p video record, 10 mp cam with dual flash, dual core processor, 1 gb internal ram, 64 GB internal memory, super super super amoled, and gives great oral...
There will be a device on the horizon with xenon flash, quad core, 2gb internal ram, 12 mp camera. 1080 p video recorsd at 45 fps, etc