Emails are now being sent out letting eligible folks know the update has arrived in the BlackBerry Beta Zone for BlackBerry 10 users. (crackberry.com)
Twitter for BlackBerry was in beta zone for couple of weeks. (fonearena.com)
RIM had this version posted up in blackberry beta zone for some time now... There are some pros and cons with this release... pros: universal search, webkit browser, update ui, and a few others... cons: slight memory leak, missing cursor in bbm.. (tmonews.com)