At this moment people can simply let me know they're interested and I'll be sure to send them an email when registration for 4 begins.
It'll probably be quite soon, but first we need to fix how the brackets are set up first. Our interpretation of the Double Elimination format isn't fairly balanced for people who lose a match early. In tournament 2, for example, noodle won five in a row for a place in the final (and would have won overall with a win in either of his last two matches), whereas dorbel (because of an early loss) had to win a total of ten times to gain the crown.
The Double Elimination format is a slightly odd one, but I think we have to use it since we have just one major prize, and instant knockout is a bit brutal after you've made the effort of registering.