As of 6:30 am PST today 5/31 my download and upload speeds appear to be throttled (but only on the tower that covers my house, as walking 12 blocks east I'll get my usual 15mbps up and 3mbps down). I ran a diagnostics network test (NDT from Google play) and it says that the cell site is capping the max throughput at .35mbps . What gives T-Mobile ???!
Note: I have the HTC One on the Uncarrier Unlimited+4.5 GB of tethering plan.