One or two people in the L1 batch of Kollossaeum have themes. The one I chose has almost no in-combat value til L5, so not using it won't be a problem.
I read some discussion about those concerns. I'd be happy to be part of writing homebrew themes for the Transitive Isles that people without ddi could use, I think that's a great idea.
Neverwinter's release date was August 16th.