I talked to some of the devs and this was the laundry list I have. They can't give out ETAs, but that would be setting yourself up for destruction by internet fans. But here is what they said, I summarized it a tad.
Revmob, AdMob and general access to Ads via SDK: They have no plans to add more networks as right now as AdMob is already supported (I understand this move as AdMob is pretty popular on mobile, maybe not to all, but it is pretty big and they only have so many devs to go around).
Ouya Support: No ETA, but they are working with Ouya on this one. .
More Access to XCode abilities: No ETA on this, but they are planning to release an SDK soon that gives you much better access to the extensions (this is what you want)
Gamestick Support No plans on this front (Time issue more than anything) as it is taking the back burner to Ouya.
WebGL status and road map: Top on the list of todos, they know it's a big deal to us and they are putting at the top of the list.
In-App Purchases There is a store API avilable already. Full sopport for iOS , Google Play and Amazon payments. Scirra will include it soon (as far as I know).
Possible Integration into Construct 2 itself/general integraion This won't be possible I think until the SDK is released
Dynamic Memory management: They are working on it!!
I know there is no timeline here, but honestly, it's a PR disaster to give off the cuff timelines for things. What I got from the reply was this. WebGL is important. Performance is important. Access to API is important. Not sure where they really stood on Ouya, could be a tight lip deal or something who knows.
I'll post more if I get some more info.