I purchased an EVO 4G March 23 (in a hasty fashion, without any research into Sprint's upcoming phones), and I bought it without much question because Sprint's cancellation department has a way of keeping you in their pocket ($150.00 rebate on top of those already in place for the EVo 4G, making the phone $70.00). I used to remember as a kid buying new video game technology as it evolved and having people tell me what not to buy now because of newer technology on the way. The Best Buy rep (who owned an iPhone) who sold me the phone didn't even ask why I was upgrading or if I had even considered holding out for new and better technology. Best Buy has that awesome buy back deal, but I did the math, and if the phone's MSRP is around or more than $700.00, I'd be paying at least $350.00 to upgrade if I kept the contract I signed 10 days ago. So it makes more sense to return my EVO 4G and reactivate an old BB Curve and hold out for the EVO 3D. The 30 day grace period for new contracts and new phones is nice to finally rely on.
As a frugal/borderline cheap bastard, I enjoy splurging in the few ares I get the most enjoyment from (electronics and music), so yes I am one of those guys who, if it is available, must have the best and most up to date gadgets. The EVO 3D has me on board because it has the dual processor, which I can imagine wouldn't even seem phased by a SetCPU under-clocking to extend battery life. The improved design, that finally features non-gloss scratch magnet bezzles (the more shiny black plastic, the more I hate my phone) is very promising and good riddance to that dorky kick stand, this isn't my freaking Schwinn. A physical camera shutter button, as simple as it is, is very appealing too. A better OEM battery has been on my EVO wish list, even though I was getting 37 hours a charge during the 10 days I have owned it.
I think the 3D potential is cool, but if that was the ONLY improvement, I would be keeping the EVO 4G.
I feel bad for those stuck with an EVO for the next 1.6-1.8 months, because you can say it till your blue in the face that you don't want it, but you DO want this phone.
I also don't truly buy into the original launch device stigma, not with HTC. The EVO 3D is a major improvement on the EVO 4G, I don't see it having too many flaws or slow downs in its first year if you ask me. If you run stock (not root) then you wan't EVO 3D to be a smooth masterful sonata of a launch, the sooner they approve of Gingerbread 2.3 the sooner EVO 4G will get it obviously.