Rumours on the internet suggest that the folks at Research in Motion (RIM) have been working overtime on preparing the Roadmap for the new version of BlackBerry OS – 6.0. A Boy Genius Report suggests that the Canadian Phone Maker has now started the development of BlackBerry OS 6.0 and it might be slated for a release in year 2011.

Blackberry has been in the firing line due to customer criticism for offering only incremental improvements offered by previous upgrades. There have been no major releases of BlackBerry OS for quiet a while now. This is in contrast to other leading players like Apple and Palm which have been constantly rolling out newer releases of their OS in order to fix issues and enhance user experience on their phones.

Along with 6.0, BlackBerry might also roll out a stop gap release (5.2) to fix high priority issues in BlackBerry OS.

It’s surely bound to be a very interesting tussle for the top spot between RIM (Blackberry), Google (Nexus One) and Apple (iPhone) this year.