Out now (on NTSCJ PS4 at least) - hoooly cow, the MD cart plays admirably close, but I'd no idea how much better the AC version looks compared to its no-frills workhorse.

Super-deep parallax, and vast pixel vistas with painterly attention to detail, like st1's waterfall that becomes a river then a lagoon, and st3's dawning towers of cloud. The vintage WWII machines really pop out. Bullet visibility isn't as good as Task Force Harrier's supremely practical magenta, but I'm surprised at how trackable the strobing B&Ws are. Fingers crossed it doesn't pull a
Sunset Sky~ howler like P47's second stage. Handling-wise, it doesn't feel too different. Relentless as expected (one thing the cart does maintain is the rushing scroll speed). Feels good having both AC and home versions on tap, ala Task Force Harrier a few months back.
While its relation to P47 is more than apparent, it doesn't play much like that one's Scramble-esque. Even calling it P47 minus terrain doesn't quite cover it, with the upped rate of attack on both player and enemy sides. Closer to Hacha Mecha Fighter's aggressive simplicity and artful density. Rocketing hori with a nippy ship, ripping spreadshot and great screen-mowing bomb. Speaking of, manual's got that same Thunder Dragon energy. Bomb or you'll be sorry!
STRIKE FORCER aka BOMBA = FULLSCREEN FUCKOFF DAMAGE (+iframes)
Expecting brutal rank if the MD cart's any indication. Reach the Central Asian weather balloon stage with deaths = LMAO pop the balloons ROFL! Reach it on a life and
MEIN SCHEISSEVOGEL IN HIMMEL
That
Under Defeat-prefiguring casualty tracker though.
You better start believing in war, sonny.
YOU'RE IN ONE 
Loving the generational shift from Okamura's inimitably breezy humoresques to Hide-Kaz's sullenly fiery garage racket. Is be all contrapuntal, and shit.
EDIT: Aww hell yeah, got that ACA Thunder Cross II / Raiden ship switch option.
Seems important too.