We send your proposal to our UX team and our policy is that we do not make a theme for a single control only, but for the entire suite.
For Q1 we will have the OfficeBlack theme applied for RadDocking too.
For the expression theme I can't go any further providing you with an estimate when it will be available. We have 2-3 themes scheduled for implementation right now.
I think that for the moment the Office_Black theme is going to be a good replacement of the Expression theme that you requested.
BTW: talking about the Office_Black theme, we are thinking for making it the default theme for the suite. What is your opinion on the matter?
the Telerik team
Check out Telerik Trainer
, the state of the art learning tool for Telerik products.