Details for 5.5 are pretty much a guarantee. Maybe a trailer. Hopefully some info about the YoRHa raid finale. It's the third act, this is when Yoko Taro usually remembers that he has to actually tell a story through all the piles of foreshadowing.

Probably some early info for 6.0. Maybe the 5.5 info will include a new major NPC that hints at upcoming jobs, like Yugiri and Gosetsu. It's probably too soon for a full trailer, but at the very least, I'm sure Yoshi-P will do his usual trick of hinting with his shirts.