I noticed that SS uses TinyMCE v2.1.3, however TinyMCE v18.104.22.168 is now available. Without knowing exactly what's been changed, I would have to think that this new version must be at least somewhat better. I'm currently having issues with it destroying certain elements and things are not lining up properly. I haven't tried the new version, so I don't know if it will be solved, but I'm curious if it's as simple as just replacing the contents of the jsparty/tinymce folder. If not, is there any plan on an upgrade to SS that will include a new version of TinyMCE?
I would say look out near the end of the month for a beta / RC release. You can see the milestone here - http://open.silverstripe.com/milestone/2.3.0 . Not all those tickets will be done for 2.3, some will be pushed to 2.4 I guess so Its hard to gauge.