Well, after a day of installing, uninstalling and reinstalling 10.2 then 10.1, it appears that Mobile 10.1.1 tool box will only show up in Desktop 10.1 and not in 10.2. So if you need to create or sync caches from ArcCatalog, don't upgrade to 10.2 yet.
Also, if you need to write to an FGDB on a network drive, don't move from 10.0 since both 10.1. and 10.2 have a great little undocumented "feature" of crashing when you try that.
So now the question is when will Mobile 10.2 be released? It sure wouldn't make sense at this point to upgrade a 3.1 app to 10.1.1 if 10.2 is "coming soon".
Any answers or insights from any ESRI folks?