As of December 96.5% of users were running OS 2.1.0 on their PlayBooks, making it the most quickly adopted PlayBook OS update over the past year. In fact a rapid adoption of new PlayBook OS versions is typical. The above chart shows the breakdown of PlayBook OS versions over the past year, and shows a far more aggressive adoption curve then the classic BlackBerry OS.
In fact only four out of every 1,000 PlayBook users are running an OS version prior to 2.0 and in fact over 89% of PlayBook users had already updated within 24 hours of it being released.
Hopefully this is a sign of things to come, and that users are equally as quick to upgrade on (the also QNX based) BlackBerry 10 phones when they are launched later this month.
The data in this post and the above chart was collected by BlackBerry AppWorld at the time of download, for downloads of the popular PlayBook strategy game Pixelated. Data shown on the chart is from the beginning of December 2011 through the end of December 2012.