I have had the new type black vinyl in my last 2 MCs. What you should figure on, is this-
The new black vinyl will get about 80-90% as hot, as traditional white vinyl. The dark blue, and dark red, will get about 50-60% as hot, as traditional white vinyl. And the lighter color carbon weave vinyl, just never seems to get hot at all.
I have quite a lot of dark color in my boat. I have never sat down and felt the need to jump back up.