B1-R

the B1-R is a proposed upgrade for the current B1-B fleet.it would be equipped with advanced radars & four F-22 engines, thus being able to achieve a estimated top speed of mach 2.2 at a 20 percent reduction of the B1-B's combat range. Additional enhancements include network centric capabilities,AESA ( active-electronicically-scanned radar), improved defensive system's as well asa opening up existing hardpoints for conventional munitions.
The B1-R is not the only proposed replacement others include the FB-22 & the YF(B)-23