Geesendou is beasting with videos, so here's some more observations
Halfmoon Akiha also has a new ground normal that looks like Ciel 6a, it also wallslams, maybe it can be comboed after? The startup on 236c(which is really her old tk j.236c) seems to be a bit slower, as even when the H-Akihas did 2c or 5c xx 236c, the opponent was able to jump. I dunno if Akiha recovers in time to be able to attempt guardbreak though.
There are also some vids of Crescent Akiha on the account. From what I could see, she is for the most part unchanged. The main change is that her ground throw has a different animation(more fire comes out), it does less damage, and it makes Akiha regenerate some life, like MBAC VAkiha's ground throw. Also, her j.236a and j.236b affect her air momentum a bit differently than they did before.
Also, it seems that for all versions of Akiha, she regains her super double jump. Those that played Melty Blood ReACT will know what this is, but it basically allows her to do air chains like j.bc dj.bc airdash j.c airthrow much easier than before.
Another thing to note is that because of the systemwide addition of sj8, 228c as an input to do instant j.22c will give a sj j.22c, which is much less frame advantage. A new method to do instant j.22c will probably be 227c, since I don't think sj7 was added in this game?