Just as promised, Apple has updated the beta of iOS 7, pushing out the second revision for iPhones, and more excitingly, a version for iPad (both Mini and full-fat). 9to5Mac's already posted a bunch of screenshots, and it looks like yes, the steam-rollered flatness goes all the way up to iPad size.
The iPad version has all the differences you'd expect when going up to the bigger screen -- apps are re-thought, with a different layout. However, the design language is pretty much in line with what we've seen so far from iOS 7 on iPhone.
Speaking of which, beta numero duo has seen some not-insignificant changes to iOS 7 for iPhone: Voice Memos is back; you can pick a gender for Siri; the Reminders app is totally re-thought; but most usefully, there's now a way to see the exact time Messages were sent and received (something Apple appears to have forgotten when leaving Symbian behind).
Hop over to 9to5Mac for the full screenshot-by-screenshot breakdown, or if you're one of those developer types, the downloads are just a-waiting in the Dev Centre (or on the torrents, for that matter). [9to5Mac]
All images credit 9to5Mac