Wouldn't this be part of the DMG? At least a tactical combat module should be there. As far as a powers framework goes, I do have my doubts, though
Well I did say in less than 10 years They've said that there will be a set of tactical rules, but I've been going by the assumption that they'd be similar to 3rd with a few tweaks from 4th that use different terminology so that 4e-haters don't get upset when they read them I doubt we'll see the kinds of tweaks that bring back the feel of 4e combat in the DMG.
But I have no hope for a powers framework in the DMG, or any time in the near future. I mean, there are bits and pieces of the powers framework throughout the 5e classes, so it's there in that sense. If they actually get to the level of re-writing certain class features to function differently if you're using the tactical rules in the DMG I'll be surprised.