OK, to answer a few questions here:
The 3 new dragons are: Blue Fire, Scorch, and Fog.
If you aren't seeing them in the eggs screen, and you've already done the new update, try updating again. I know someone who had that problem today and had to do the update twice for it to work.
I got Scorch on my first try it was: Lightning on the left and fire on the right in the breeding screen for me. Egg looks just like firefly egg, hatch time is 3 hours, it's red with a turquoise lightning bolt.
I got my Blue Fire on my first try also it was: Fire on the left and Ice on the right in the breeding screen for me. Egg is Red with white snow flakes. (and yes cold is not compatible with fire)
I'm still working on the Fog, but I'll let you know when I get it.