I'm tempted to enter my new Legacy-class, but I think at first glance it looks too much like the Sovereign to have much of a chance.
I'll bet a lot of the submissions are going to have that problem. Me, I'd love for the new design to look something like a massive version of Spock's Jellyfish
from Star Trek '09.
Ironically, we'll probably never see a truly canon version of the Enterprise-F, since we'll probably never see the prime universe any more. And...December 9th? That's only a few weeks from now. There's no way they're gonna get a well-though-out design in that time, unless people are just gonna send them old stuff, which kinda defeats the purpose of creating a new