I've heard (so take it with a grain of salt), that they're not being released until the LEs are all sold.
Hard to tell if Premiums will even be released given the poor reception to the pin so far.

Its available now.. PM me your email but the prices are pretty close to LE's at this time.

Played avengers at pinfest. Does the ball always get stuck behind hulk? Really ruined the game for me when I played for the first few times. Never went back to it because of this.

And the LEs won't ever go on sale, correct?

Mine very rarely gets stuck behind him. Maybe once every 20 games or so.