Hi Nohinn,
As Silverlight 5 is completely backwards compatible, for the time being we'll keep the official releases on Silverlight 4. We are definitely looking into the new beta release and at some point later this year we'll come out with a Silverlight 5 specific release. The date is not decided yet, but we will keep you posted in the blog posts and newsletters.
Regards,
Nick
the Telerik team
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