I am quite confident mounts aren't even on Larians radar. It would be nice but with the current warp-camp and rest mechanics I think fast travel is superfluous. Buying an elephant or horse to carry/ride would be great if the mechanics remotely required it. I do like the idea of gnome rangers riding giant spiders and other acceptable lore additions. We could even test the long debated reduced (5th level spell) gnome riding his own magehand theory. 5-inch gnome flying around on his magehand sounds hilarious, wizzing around the room like a fairy casting fireballs sound like a build worth trying.