We'll let a few weeks go by before the new one starts. However if you're certain that you're able to play in the next tournament, and have chosen your race for it, post in the following format to sign up. Do not sign up yet unless you're sure you will be able to participate. Races cannot be changed once the tournament is underway. Make sure you're logged on your account and then:
In Game Name? whoareyou
Race? terran/zerg/protoss/random
Can you host games? yes/no
The reason for the third question is so we don't have any matchups that cannot be played. Answer honestly and we'll work something out. If you're still confused on the format to post in, look below for an example.
See The Official Tournament Deadlines and Extension Page for scheduling regulations to be met.