Yep, for several days last week, previews of all of my hd video at fotolia were showing up on Adobe Stock. The previews didn't play and they are not showing any longer. I had an email awhile back from fotolia asking me to upload more of my video prior to the launch on Adobe Stock. I believe it said that hd videos would be priced at $75 (same as on fotolia) and 4k would be "competitively priced" but they couldn't tell us the exact price at that time.
Sounds encouraging but I won't be uploading any 4k until I find out what "competitively priced" really means.