I had this crazy thing happening, I have 2 owncloud servers. I did an update it one, and successfully upgraded to 10.0.0, days latter I tried to do the upgrade on the other server and there was no new releases... I came back to the first server checked the version at the repository, and was the 9.1.6.
I read that they pushed the 10 to the repositories by mistake and they took it out. I'm not in a rush to upgrade. But I'm sort of scared that they are thinking about making owncloud under pay license. That will be bummer since I love the project, and I use it for my personal stuff. I participate on the translation to Spanish like a lot. I'll just keep waiting until the 10.0.1 or .2 stable is at the repository (hopefully)