I have a first draft preview guide for the 9.2 mounts up now:
https://www.warcraftmounts.com/patch92.php
It's still early days (the PTR isn't even released yet!), so mount info will probably change a LOT before release.
Of 38 new mounts, 24 are listed as being obtained through a new crafting feature called Protoform Synthesis. This will clearly be an important part of mount collecting in 9.2, but it's hard to know if all 24 really will be obtained that way, or if the listed source for some of them is just placeholder info. It just seems like a lot!
Patch 9.2 mounts
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Patch 9.2 mounts
Shaman avatar by Spiritbinder.