WP8.1 Released Date is...? & When can we expect the 1520 to get it?

I walked by the AT&T store today, walked in and handled the 1520 for fun. It was like getting hit in the head with a brick: I just decided I want a 6" phone, big and bad ass. I want to whip it out at the bar or the office and just gaze down at other people's puny displays with pity.

Maybe this feeling will be fleeting. Or maybe the 8.1 release will be really amazing. I dunno.

How long do I have to wait to find out?