There are two teams involved in each Star Trek season set brought to you on Blu ray.
CBS Digital, who painstaking redo post production on the whole show from scratch. Something like 52 TNG episodes in a calendar year, I'd estimate.
The other, producing brand new extra features like documentaries and various featurettes, getting them ready to deliver, as and when each main disc content nears completion. Other than that, they've got to have something to do, while they're waiting I suppose!
Since it's already mastered in HD, CBS Digital doesn't have to touch ENT (although I'll hazard a guess I'll end up wishing they had improved one or two things still not possible to spend longer rendering for a weekly TV schedule, but there you go).
Betcha wouldn't say they were spreading themselves too thin, if it were DS9 they were spreading themselves too thin for... Well, until it arrived and there was a noticable dip in quality.