I'm playing SRW:L now (which is absolutely great) and I liked the Queens Blade game so I'd LOVE an SRW-style Nanoha game. But the screenshots in the other pic don't tell us if it's SRW-style or just another Magical Arena-esque game.
I suppose if they make it between A's and SS then they'd have enough characters to make it as an SRW game. Queen's Blade worked okay with only 10 or so playables.
Info says it will inmclude characters from ViVid and FORCE, apparently a sequel to "The Battle of Aces", so maybe is a time paradox story or something similar.