Jade and Rose definitely like each other! I do think they probably have the weakest bond of the kid/kid friendships but that's only because the others are so strong.

The mild canonical support for various pairings moves so fast it's been quite illuminating seeing which make me go yay/no/meh. "Contains Terezi, Dave and/or Karkat" seems to be a common factor :) (I quite like Dave/Jade most of the time, but only with associated Dave&Terezi friendship, rather than associated Terezi off in a corner crying alone)

The most recent update is making me think "Dooooooom D:". I'm sick of seeing endearing animal/human hybrid children die :(