We've already seen that a new character from Samurai Warriors is coming out next month... but at least the new stage is from DOA; Azuchi -- from DOA3. This classic level not only looks gorgeous but has plenty of walls and torches to send people through staying true to the importance of environmental damage.
The patch notes are here, and they have stirred up a lot of controversy in the competitive group. From Sweet Revenge being salty about Genfu's 44P nerf, to Sly Bass mentioning Akira's changes. Some of the adjustments are still a little hard to understand, but the translations will give you a good idea what to expect.