By 2015: android 25 %, iOS 32%, webOS 10%, RIM 15%, win7 18%.
Android is like nokia's symbian. I suspect Google will have to deal with Oracle rain in terror and causes some instability in the os. Also, suspect the weakest android hardware companies will fade into bankruptcy. Samsung, HTC are the strongest. LG,Motorola are weaker. Others are even lesser known.
Apple's iOS will continue to evolve! os X lasted 10 plus years and so will ios X.
HP webos may or may...