From the Sencha Blog:

"We’re excited to announce the availability of BlackBerry 10 support for Sencha Touch! Developers can use Sencha Touch 2.1.1 to create amazing web applications that run fantastically well on the BlackBerry 10 browser. We’ve been collaborating with the team at BlackBerry for the last few months on two paths: first, to optimize Sencha Touch to run on the BlackBerry 10 browser, and second, to build a whole new theme and a set of components to make building BlackBerry 10 applications as easy as possible. Developers can use these new features in Touch 2.1.1 to build new BlackBerry 10 applications or port existing Sencha Touch apps over to run on the BlackBerry 10 platform. BlackBerry has published a handy guide for porting applications."