The warp core pic has been picked apart pretty thoroughly so I'll just say I've never liked the color purple and leave it at that.
Yay! Finally a new Klingon ship! It looks like they took some inspiration from the Dominion with the design, especially with the nacelles. It makes sense considering how many Dominion ships were captured at the end of DS9.
The Miranda just looks really busy. Considering the emphasis that has been placed on customization I'm hoping it can be smoothed out and toned down a bit. It also seems odd that it would still be in service. I'm assuming that it's a new ship based on the design of the Miranda. I've always liked the design of the Miranda class, so I'm glad to see they're keeping it alive somehow.
I also really like the screenshots from ComicCon which don't appear to have made their way into the screenshots here yet.
Some of us are hoping that a few of the different races within the Klingon Empire faction (Gorn and Orions etc) will have some of their own ship designs to use in place of Klingon ships. I've never been happy about permanent non-Klingons officers on ships in the KDF. It's just un-Klingon.
"We are Klingons. We don't embrace other cultures, we conquer them."
Martok (You Are Cordially Invited... - DS9)