afeher1 thanks for the info on Visual Studio.
To answer your question about why we haven't added support sooner. While I agree the ideal would be to have support before the final release is out, the reality (and I'm drawing on our experience with IE10 as well here) is the rendering engine changes up until the final build is out. If we fixed all the 'bugs' in Confluence with the previews, we'd possibly be just creating bugs for people in the final version that we'd need to circle back and undo.
Coupled with the fact we see very very low usage in our analytics until the final release is out for a little while on Windows 7, it's not useful for us to look at support until the final build is ready.
To update everyone who is watching the ticket, we're working on the identified issues as we speak. We're tracking these publicly here on JAC if you want to monitor the status of any of them specifically. If you've seen something else that's not there then please feel free to raise a new bug.
We've now completed our IE11 support work. The final bug fixes will be released in the next OnDemand upgrade, and the next Confluence bug fix release for download.