The active development of 3.x is stopped and we are working on 4.0 edition. There will be SP5 with some fixes, but it is not scheduled for now. The SP will include some critical issues that we found related to the performance. Between version 3.0 and 3.7 SP3 we released patches and versions on each Q which is about 4 times per year. Since we have a new version - Sitefinity 4.0 the 3.x patches will be released once or two times per year, but so far we have not made certain plans for the SP5.
the Telerik team
Registration for Q1 2011 What’s New Webinar Week is now open. Mark your calendar for the week starting March 21st and book your seat
for a walk through all the exciting stuff we ship with the new release!