SERIOUSLY. The very first deadline is approaching, September 15th for Artist Alley requests. Via an email from Justin Dutta that just went out to publishers:

The deadline for Artists’ Alley this year is quite a bit earlier than last year.

I wanted to make sure you had a copy of the AA application to send to any of your Professionals who might be interested in a table. If anyone is interested we need to get the completed application in the office by September 15.

You can download the form here.