Colossus can be re-introduced in some form.
Hurricos being similar to Concurrent Skies a.k.a Cynder's Lair can be a nice addition too.
Uh, I always thought of Hurricos as a pretty tranquil level. I mean, the music is very relaxing for one thing. And the enemies aren't that intimidating. Making it similar to Cynder's Lair is the wrong direction IMO. <.<;