Interestingly, our brethren over at Engadget Chinese also spotted a TD-LTE-ready Samsung Galaxy S III at China Mobile's MWC booth (note the "China Mobile 4G" logo on the back of the phone, pictured above), but it wasn't mentioned at the Global TD-LTE Initiative summit at MWC.
As Cohen and Rosenstein point out in their letter Friday, TD Ameritrade isn't saying a big merger is a bad idea, just that they want to take their time.