Granted, there's not a lot of concrete information, but there is something--the high-level design goals, dev Q&A, L&L columns, and playtest impressions.
For me, these things don't paint a good picture of 5e. Making a rules-lite version of D&D isn't something that I was aware people were asking for--look at the support for skills and feats (even non-Vancian magic!) from that last poll, those things should be built into the core of the game.
The backwards-looking nature of the design is also frustrating. Monte's Arcana Evolved had a really innovative spell system that allowed you to cast a spell with a higher or lower slot for a different effect. You could even add nifty "spell templates" by using extra slots of the same level (which is MUCH more workable than 3e's metamagic).
Mike's Iron Heroes had a great system where all these warrior classes used tokens to manage their special abilities. I could see how these could plug into 4e's power system--maybe your at-wills given you tokens you use to pay for the equivalent of encounters or dailies. Fights would get more intense with each round, and it would solve the problem of players going nova at the start.
Both these mechanics have a lot of potential and could add a lot to 5e. But instead the developers want to dredge up awkward mechanics that were replaced for a reason. Innovate, and take the game forward!
(And it doesn't help they seem oblivious to the existence of 4e. Play it, it's really quite fun!)
Lastly, 5e means we're not getting any more 4e products. There's a lot of life left in 4e, and I would have like to see it mature, especially on the heels of Essentials. Near the end of 3e saw some really creative products, like the Book of Nine Swords or Magic of Incarnum. What unexpected offerings could 4e have offered?
5e will be the heir of my RPG of choice, and I'd like it to be at least as good as its predecessor. No lasting emotional trauma I'm dealing with, sadly

Maybe throwing my 2 cents out there can lead 5e in a better direction, if not it's at least fun to talk about.
EDIT: Oh, and I'll be participating in the playtest, even if my enthusiasm has about bottomed-out, maybe playing it can change my mind.