I think we should wait a bit before opening submissions just to make sure we're not on some sort of "CCLP4 high" at the moment. Take some time for us to simmer down and maybe figure out what to tell people when designing levels without blindly making a "CCLP4 submissions are open!" post.
For example, one thing that seems popular is the idea of non-homogeneity, as in levels that aren't all "a little bit of everything" but that have specific twists to them, like in CCLP2 but without invalid tiles.
Right now I'd offer late September or October for a submission opening. Don't want to rush it, but don't want to leave it to the point where everyone's just waiting. Sure, we may have "just" released CCLP1, but it takes a few years for submissions to be voted on.
For example, one thing that seems popular is the idea of non-homogeneity, as in levels that aren't all "a little bit of everything" but that have specific twists to them, like in CCLP2 but without invalid tiles.
Right now I'd offer late September or October for a submission opening. Don't want to rush it, but don't want to leave it to the point where everyone's just waiting. Sure, we may have "just" released CCLP1, but it takes a few years for submissions to be voted on.