Camels are just an example. What they really wanted to show is that:
1) Skeletons for mounts are actually working. If you ever saw an elephant in an M&B mod (say, Perisno) it always resulted in an ugly cluster of glitches. However, this camel looks natural, hinting that any stupid mount we might think of won't as well. So yes, you might be able to run around on arhino that doesn't glitch through existence
2) Now you can have actual terrain based penalties and bonuses. I liked in WB that when you entered a forest you suddenly slowed down a lot. In Bannerlord, camels are given increased stats in desert. This means that it's actually moddable to, say, reduce morale for non-vaegir units in snowy terrain, or having kerghits faster in the steppes, and these bonuses and maluses can affect pieces of equipment as well.
Those new features open up SOOOOOOOOOOOOOOOO much in terms of modding. Can't wait to see, for example, Battanians having increased melee damge in the forests thus being able to ambush Imperial troops, who are just faster and have better morale than other factions, meanwhile Vlandian horses are slowed down by rocky terrain.
I have 1 question: Can the vicinity and the relation of a settlement affect our troops as well? IE: Sturgians are able to fight better near their homes, but get rekt when they're in enemy territory.
This is going to be the most underestimated Dev Blog, sadly.