IDC: Android and iOS Reach 96.3 pct of Smartphone OS Market in 2014

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This just goes to show that your apps and content should continue to be optimised for the top OS before you move to the next on the list. Ideally, you want to cover them all, but that's often not cost-effective.
I can't see these figures changing significantly in the short term.

Android and iOS inched closer to total domination of the worldwide smartphone market in both the fourth quarter (4Q14) and the calendar year 2014 (CY14). According to data from the International Data Corporation (IDC) Worldwide Quarterly Mobile Phone Tracker, Android and iOS accounted for 96.3% of all smartphone shipments, up slightly from 95.6% in 4Q13 and from 93.8% in CY13. In terms of year-over-year shipment growth, Android outpaced the overall smartphone market for CY14 (32.0% vs 27.7%, respectively) while iOS beat the market in 4Q14 (46.1% vs 29.2%, respectively).

"Instead of a battle for the third ecosystem after Android and iOS, 2014 instead yielded skirmishes, with Windows Phone edging out BlackBerry, Firefox, Sailfish and the rest, but without any of these platforms making the kind of gains needed to challenge the top two," said Melissa Chau, Senior Research Manager with IDC's Worldwide Quarterly Mobile Phone Tracker.

http://www.idc.com/getdoc.jsp?containerId=prUS25450615