I'm not even sure they're going to get around to the prequel. Although making the credits all about it is probably a good sign.
So yeah, this was pretty much everything I'd hoped it would be. Slapping a healthy dose of Utena-tastic architectural shenanigans helps keep the intense dialogue focus visually stimulating.
As I suspected, this material is pretty much a perfect match for Shinbo's stylistic excess; he'd far rather depict the characters wandering through a flickering film frame as hand written keywords dance beside them than waste his time trying to oversell the humor. The constant rapid fire patter is still there, and delivered in with an understated confidence virtually no other anime director has the sense to use.
Plus, we know exactly what the main lead's brain is made of.
It remains to be seen if there's an fansubbers - or professional translators - up to the staggering amount of work involved in translating both Shinbo's word on screen spam and NisiOisin's bracing word play deluge, but even raw this sucker's a visual tour de force, and an absolute must see.