There are a number of tracks that were on the early rumoured track listings for the Anthologies back in the 90's, maybe we will finally see those.
I do wonder how they would package an Anthology 4 considering the first three were three individual parts of one complete series - and didn't George Martin say something to the effect that what was released was the best of what there was thereby suggesting the rest wasn't that great? Beatles fans obviously know that is garbage but surely some of the media would pick up on that and reflect the question back on ...