Orc mount is the way to go. We got Khajiit mount recently so I don't see why not.
"I bear the cruel weight of certainty. Total, absolute, relentless certainty. People rarely comprehend the luxury of doubt... the freedom that comes with indecision. I envy you."
―Sotha Sil
Wamasu (or giant lizard), echatere, durzog and a smaller Mammoth (obviously bigger than pocket mammoth but smaller than the regular mammoths) would all be cool mounts to see in the future. I’ve also read folks looking to see flightless gryphons as mounts since Summerset but I’m not sure if that one is as likely or feasible as the ones I listed earlier. Either way I think these ideas are pretty awesome.