Yup, the name change was kind of a head scratcher.
At first, it looked cool, as Saxon descending names can be seen as weird in a still mostly romano-briton world, but I think the name changes were sometimes a bit strange and haphazard, with some being changed while others remained. So I welcomed the change back to the originals on that. Now, it sure makes some of the supplements a pain to navigate, and it would have been better had the names remained in place throughout.
Book of feasts, at least some of it, has already been incorporated into rhe core rules, and for the rest, given the history of KAP, I think everything will be very retrocompatible.
I do hope we don't end up with several different economic systems though, or battle systems, just like in 5th Ed edition history. I'd much rather see the core rules being expanded rather than replaced altogether.