I wish AT&T would hurry up and at least tell us when it'll be available. Right now, there isn't really an upgrade from my 920 except for the 1520, which is way too big for my taste. The 1020 has the old S4 processor, and I don't want to upgrade from my 24 month old phone to a 14 month old phone. I'd rather have a newer flagship that'll hopefully be more future-proof. That's why I got the 920, which I'd just continue using if it wasn't dying and having so many software issues (which I've tried to fix with hard resets and re-flashing the phone... everything just got worse. Especially with AT&T's release of the Cyan firmware. The DP of WP 8.1.1 on Lumia Black firmware was way more stable.)
Maybe there's something to do with the timed exclusivity contract of the M8 that says that other carriers can't announce a release date until whenever, but whatever it is, it's working because Verizon looks more and more appealing every day. You really dropped the ball on this one, AT&T.
(Sorry if that got a little rant-ish. Lol)