While we were examining Dr. Abernathy's neat way to keep the motor going above 3.0 M, GE was testing their new motor that implements some of the same concepts and reflects my view of the annular bypass.
"Superjet" variable cycle jet engine could power future fighter aircraft
Worth a look to see motor concepts of the next century compared with what the good Doctor did 50 years ago!
My own view is not to have an extra "fan" disk but use the outside duct as a true "ram jet" and same sorta inlet configuration the Blackbird had. CAUTION!! Don't get all excited, Lyman.