Many of us have been asking for this as it is becoming increasingly popular. Hopefully enough of us will ask for this that Paul can get it in for us. It would be a huge boon for game devs and right now we can do some of the functionality with HockeyKid's mods, but it isn't enough.
Web server with PHP is what we're using, but the social features of Google Play services are much more verbose and even helps your ranking in the store.
We also need OpenIAB which will allow us to use alternative stores for our apps such as Amazon, Samsung, and SlideMe.
Hopefully Paul will be able to listen to our pleas!