Did WPF announce a date or a version which will allow UI background thread?

Did WPF announce a date or a version which will allow UI backgroun开发者_运维技巧d thread?

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You can set a simple value used in data binding from a background thread, right now. There have been hints (see Rob Relyea's PDC talk) that some future version of WPF will allow bound collections to be modified from background threads, as well. This would, I'm sure, not happen until at least the next major release of WPF, as it wasn't included in .NET 4.0.

That being said, there have been no discussions about allowing direct access to UI elements from background threads.