(adsbygoogle = window.adsbygoogle || []).push({}); i guess there a new avatar update comming soon (dont know exactly what day) and i guess u can put like stuff on from games like halo odst or watever but u have to buy with microsoft pts.
if you go to inside xbox on your dashboard if u have xbox 360 it will say something bout xbox live update so check it out it looks cool

The update is happening on the 11th i saw it on X-Play on G4