Yes - we do bugfixes on CTP controls. The situation with TreeList is a bit different, because based on the feedback we've got it turned out that it will be better if we base this control on the RadGridView. this will allow us to use the grouping, filtering, horizontal virtualization, etc.
This control will be public in Q2.2010. There will be many breaking changes to the existing CTP version and it is not good to base your plans on it. Any feedback meawhile is welcomed. You can see the same info on our roadmap page:
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