Hell yeah, that's so soon!
I don't need to prepare anything with my current OG char, right? Though I might as well login before the 9th to check things out.
Yeah, there's no need to prepare anything, though, you can use the character creator/benchmark tool to check out the new body/face models for the NGS launch, since there will be some incompatibilities between old and new.
Hairstyles - no incompatibilities.
Face cosmetics (eyes, makeup, ...) - new cosmetics only work in new faces, old cosmetics only work in old faces.
Outfits - new outfits only work in new body models, old outfits only work in old body models.
Face and body - no incompatibilities, new face models can be used in old body models and old faces can be used in new bodies.
Accessories - no incompatibilities.
Old models don't convert well into the new models though, so some tweaking will be needed if you want to use the new models.
PSO2 and NGS have different updates?
Seems like the graphics engine update is going to be the final update for PSO2, with the NGS release it doesn't look like PSO2 will be receiving any more updates. Previous systems that were manually updated are either being removed or replaced with automatic systems too (all urgent quests will be random, mission pass and fresh finds shop will end, seasonal lobbies will be automatic, ...).