My guess is a double Mono Lp set, with outtakes/alternative versions lp, and a book or something along that lines in the $50-60 range.
Blue Train was done in a single session. So, don't expect any new material beyond what has already been released. The title track was done in 9 takes, the master take is a composite, so the take used for the piano solo in the matser take is gone - cutting floor. There are two complete takes, but unfortunately they detract, not add. The others are breakdowns of one sort or another. There are two alternate Lazy Birds, one with Coltrane's solo edited out. It was probably a 3 or 4 hour session - the studio would have been booked for one of a morning or afternoon and given the amount of time spent on getting a good take of the title track, and less, but still several tries at Moment's Notice, the session time is pretty much used up.
As a cohesive album, the original is as good as it gets. Why bother with very inferior alternates that nobody ever wanted released when the original is the one that counts?
Even a 'Coltrane on BN' type box doesn't work. The jam session material he was on as a sideman isn't near up to the Blue Train material. Again, it just places the masterpiece in with the ordinary. That, IMO, does no favors to Blue Train, although it does favor the accountants at Universal.
I have no interest in this as I have the MM 33, which is in mono, which really is the way to go with Blue Train.
My guess - 3LP set. Stereo, Mono, the shitty work takes. Some pics, some not needed words, a nice box, look for it to come in at about $100.