The big questions for me (disclaimer: I'm a professional classical pianist) is that of scholarly review. The go-to publisher for Bach today is Bärenreiter/Neue Bach Ausgabe, and by and large, any edition of Bach that I use that isn't Bärenreiter should ideally be cross referenced with it. Of course, it is very expensive to purchase, but it is one item that any university with a music program simply must have in its library. What concerns me is that TFA simply is vague who or what they mean by scholarly review, and this alone would prevent me from considering it over current alternatives.
IMHO the value in the project will be a (hopefully) excellent recording that is CC licensed, as there doesn't appear to be any decent recordings of the sort (through a cursory search), unless you include Wanda Landowska's eccentric harpsichord recordings from 1945. Genius is already easily available in recordings on piano by Gould (both 1955 and 1981), Schiff, Hewitt, Barenboim, Perahia, and Leonhardt on harpsichord.
"I've finally learned what `upward compatible' means. It means we get to keep all our old mistakes." -- Dennie van Tassel