So, Belkan Style (or type) is confirmed. Eltrian style is called "Industrial", and the Materials belong to it. Midchildan Style might not be called such; hasn't come up yet.
No meaning for any of that has come yet either.
Avatar types mentioned thus far are Fencer, Professor and Lightning. Basically: Signum, Yuuno and Fate.
Arisa's the same type as Signum, and if Yuuno appears at all, he'll be a Professor type.
On that note, it seems all players get a Device which serves as a helper interface. Will Yuuno continue to be the one exception, or will he get his own pair of gloves?
"Snow White" for Suzuka, huh? Claws aren't very princess-like.
"Flame Eyes" for Arisa. Is this another Shakugan No Shana joke?
Nanoha is Hax. She's a shooter, not a tank. She's not supposed to be able to BULLDOZE her way through buildings! Certainly not with just flying and a barrier defense.
And with the likes of Vita and Signum, there's no way that such a tactic hasn't been tried already, so the surprise is unwarranted.
If Vita can have her stuffed rabbit as a helper, it's possible that Fate has a virtual Arf pet. That would be a bit sad, though, since it would be a fake. (Not like the manga would ever use Arf; not when the artist can pair Fate up with Nanoha.)
The manga is apparently taking Alicia's age seriously. It's deliberately making her out to be an older sister who happens to be a REALLY late bloomer, and who prefers to act more immature than her younger sister.
And Fate loves her, but finds her antics REALLY embarassing. An amusing dynamic.
(Much more entertaining than the stale yuri subtext between Fate and Nanoha. Which doesn't even have the pathos of the original series.)
All in all, I have to wonder where the dramatic tension is going to come from, in this manga. At least with Accel World, succeeding at the virtual game provided real powers to use in the physical world.