Intellisense in ASPX

I'm playing with the latest build for 4.0 marked as "working" and I noticed that there's Intellisense for control attributes in aspx (as in <asp:Label runat="server" ID="x" Text="<%# something actually shows up %>" />). Is this a new 4.0 feature or has it been there in 3.x as well? (Pretty cool!)

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