T-Mobile has posted that android 5.1 is dropping for the nexus 4, 5, and 7 starting today. The date on these sorts of things isnt always correct (remember Sprint's debacle?), but its a fairly safe assumption the update for our 6 will be happening as well, whenever the release may be. We also know the Verizon version that debuts on March 12th will be shipping with 5.1, so its really only a matter of time. https://support.t-mobile.com/docs/DOC-5034 No changelog available yet, although 5.0.X has had its fair share of bugs. Hopefully this squashes quite a few.