T-Mobile to rename its HSPA+ network as 4G?This article contains unofficial information.
With Sprint's WiMax network covering 120 million people and T-Mobile's HSPA+ reaching 200 million, the latter has already had documents leaked where they call themselves "America’s largest 4G network". Even T-Mobile's web site makes references to 4G. Replace HSPA+ with 4G and with a couple of quick pen strokes, the nation's fourth largest carrier becomes its largest purveyor of 4G service.
Perhaps this is what Project Emerald is all about.