all unofficial roms using p880-dev sources (unofficial) and all official releases are based on "official" CM11 sources
unofficial ones are based on grouper blobs but there was a problem with camera so @Adam77Root
made a little hack to get it work. So now camera is working ( little bit buggy) video rec is not working till Adam end his hack, but screenrecording is working here and not on official. overall IMO grouper blobs seems to give a smoothier experience than official ones, and they can give us hope to bring future releases of android on our p880.
there was also many many other thingsXD