From two very separate people in two very separate parts of San Diego Comic Con, I had the exact two names as publishers gunning for the Doctor Who license, now that IDW and the BBC are splitting at the end if the year.
The two publishers are Titan Comics and Boom! Studios. Titan Comics are local to the UK, but there is already a running Doctor Who comics licence in the UK for Panini. Boom! have shown success with some licences, but Doctor Who is a different kettle of fish to their previous work in that area.
One twist is that the decision to end the IDW/BBC Doctor Who license is that a planned Doctor Who series written by Mark Waid has had to be dropped.
Unless Boom or Titan want to get in touch…