breakdown of "new" mode 
- 2021.07.15 12:26 (UTC+0)
Almost nothing about this is new.
It's not a mode it's a side story that will go away... Also since they are calling it a story it should have that right... nope just a sentence of dialogue about coldness.
All old art assets.
The rewards if you want to call them that are not anything more than we would have gotten from side story (which they have skipped several weeks) So no actual increase in awards given and the mode goes away... and this seems to have replaced the usual side story runs which means we may in fact be getting less content in big picture.
I won't speak to the difficulty each player will have their own take on that. (maybe you can't auto it)
Everyone who wouldn't shut up about this being the sign of "new" content can officially eat crow. This further proves everything I have been saying is true and this game is going under fast. Can't wait until they hype up the 1 new skin and 1 new unit for summer in a week and act like that is enough development work for the entire summer.
EDIT: I totally forgot how silly it is they rammed the light connections into this mode when it's been nearly 600 days without them in world boss mode... and they are only giving you a 3-5* connection. Enjoy those Elsons.