First, the easy one. Yes, the xmod and xprj files work fine with v11.
For the process list, the v9 to v10 upgrade was smooth and the process list didn't need rebuilding. Bu I don't know whether the v11 upgrade installation will read in the v8 database nicely.
DataPump v10 introduced a nice feature to export the process list as XML, which is very handy for moving processes between DEV and PROD machines.
All the best,