I think that thy just fixed a bad bug from last week where you will join a friends party and all 7 poeple have the same gammer tag it goes away in 20secneds or so but still iv been getting it and so have all my friends on xbox. if it is a bug i hope thy
fix it. really did not see anything new with apps or games.
it updated both the dashboard and kernel to version 2.0.14719.0 so i am guessing its an anti piracy measure and checking for flashed and or otherwise modified xboxes as well are more performance and color space improvements.