DPI is supported via GPIO, faster than SPI , 50/60fps.
Some DSI stuff is coming, Eric Anholt has done a little on this recently.
So one day maybe more than just the one Pi display, which is well supported.
A would say 320x240 SPI have good support.
DPI it pretty good and has high frame rate and 800x480, Hyperpixel etc.
I'm dancing on Rainbows.
Raspberries are not Apples or Oranges