Lest there be any doubt in your mind that the January announcement of the D&D Next Playtest was anything less than a knife in the back of the not-even-four-year-old 4E system, check this out: WotC’s 2012 Holiday Guide, which features not a single 4E-specific product.
1E reprints? Check. 3E reprints? Check. Anything specific to the 4E ruleset? No check! And if your first response is to point out that “Hey, they’re just highlighting all their releases over the last six months or so” … well, yeah, that’s kinda the point.
And people wondered why I compared 4E to New Coke.