I just got done with training a couple of weeks ago. The majority of the classes going right now are Shuttle. The groups have been mostly FO's going right now...about 25/class is what I have seen. There is a break until Aug, and there is another Shuttle class that's going to start if I remember correctly. Other than that, not sure.
On another note, I think that if this place doesn't implode in the next couple of years, you will see a lot of movement here. I think it will be a lot of guys from the top if the openings are there for the major's. So I can believe a 2-3 year upgrade time...but it all depends on how many people leave at the top. I think it will happen.
Got the info from HR that 40 guys are in the hiring pool now. They plan a class in July and August and as you say it is for Shuttle!