I was able to get both the teensy 4.0 and 4.1 to work with the new v5. With some external memory added to the teensy 4.1, and a bit of help from Marc Merlin, I was able to drive 128 x 192 with reasonable framerate.
One thing I did notice when getting it up and running at 128 x 64 was that my panel layout that worked on the v4 with teensy 3.6 had to be reversed for the new setup.