A couple of years back WB/Rhino were looking to put together a complete anthology of the Loma label. As well as compiling all the A & B sides into one box set, it was to also include a good trawl through the archives to find any unreleased material.
That though, was a couple of years ago, and I've not heard anything since. As I recall, Rhino laid off a good number of people some months ago, so it's possible that the Loma project was shelved along with any intention to dig in those archives. WB did, of course, recently reissue a number of Loma soul tracks in the States - on 45! This being part of their re-kindled love affair with vinyl.
Is there unreleased material in the Loma archives? Of course there is.