The he500 is a tremendous buy at it's current price point, regardless to a degree of future offerings. There may or may not be problems with design and production with the first release of the new hp's. The he500 is tried and true and a sure thing. If it weren't for the fact that the weight is an issue for me, I'd have already pulled the trigger on it.
Only you can decide if you want to wait and see what the new hp's ultimately have to offer.