I think it's way too early to speculate. I'm pretty sure we'll get some more pics soon.
Anyway, here's my speculation.
IF that's actually the production version Interga:
IDENTICAL chassis, Same doors, Same windows, same basic dimensions, same interior space, same engine bay.
Different C pillar chrome piece, Unique Front/Back and interior design with more "premium" materials.
MVH and Suspension tweaks.
Calling a "rebadged" Civic Integra will trigger a lot of people tho.
I don't mind nicer, sportier Civic with Acura badge, but I would be seriously disappointed by Acura's decision making.
If that's a test mule of Interga:
Same platform (we already know) , similar dimensions, same engine bay but totally different Exterior/Interior design.
Front/Rear bumper and lights might be from actual Integra but who knows.
A lot of companies use test mules even after building production spec test vehicles.
Acura had a few 1st gen TLX with TLX-S drivetrain and front end.
They might be doing the same thing again. It does make sense too, since the Integra will be based on the Civic.
It can be unrelated to Integra too. At first I thought it could be next gen Insight. But then I saw the exhaust lol