I'm afraid the release notes aren't quite accurate - the changes in the advanced form came with Q1 SP1 release when we extracted the recurrence editing functionality in a separate control. This is a pretty major change, so we recommend any customizations to be re-applied to the new template. You can also use your old templates, they'll continue to work.
For Q2 we've only added support for reminders. Basically a drop-down plus a few lines in the code-behind. If you don't need reminders feel free to use your existing templates.
I hope this helps.
All the best,
the Telerik team
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