Those Akai Katana Shin clips from earlier in the week were mostly boring tutorials. Today, Cave released a real trailer!
Have a look at the bullets in all their tremendous hellishness below:
[end_p text="Continue reading for the trailer." /]
The last half of the trailer shows the game's "Zetsu Akai Katana" mode. As far as I know this hasn't been fully detailed yet, so you'll have to figure out what's different by scrutinizing the trailer.