Just noticed that TI is annoucing upcoming SuperSpeed USB3 adapters with JTAG interface.
Maybe good choice for future BusBlaster :)
http://e2e.ti.com/blogs_/b/interface/ar ... ssage.aspx (http://e2e.ti.com/blogs_/b/interface/archive/2011/04/12/two-superspeed-usb-announcements-same-primary-message.aspx)