I'm really not too concerned with the naming as it stands. The new 645T file is actually a 16-645E3, but with all the other 645 variants out there it makes sense to leave it named more generally until we get the other variants recorded. And those will come. Eventually we will have all the 645 variants, beginning with the most common...16-645E3, 12-645E3, 20-645E3, 16-645F and so forth. This will naturally include the non-turbo variants in all their glory. When they roll in and are available it makes sense to be much more specific. Either way it doesn't really matter....in the end we'll get the sounds that we've all wanted for so long.
I know that a 16-645E (roots) was recorded but the recording may possibly have too much noise in it. There are others that have been and are planned to be recorded.
I'd stress that patience is a good thing here. Basically all of the new (and I might add excellent) recordings have come from just one of our own RPUG members here. He's taken it upon himself to provide better recordings than are available in the marketplace now, and it takes RE time to convert those into useable files. You won't be disappointed in the new sounds, I'll tell you that. RE has done something interesting in the coding and processing that makes the end result sound much nicer than any DCC offering I've heard.
-Kevin