On Nov 16, Flight 8 reached 25,040 ft, over 2,000 ft higher than its previous 23,015 ft record set in test 7, and reached a new top speed of 499 kts (Mach 0.82).
See
https://www.aero-news.net/index.cfm?do=main.textpost&id=81102FD9-9509-4EFC-A742-51C3D97548D7
Still really just "baby steps" in the initial flight program, currently investigating stability parameters.
There won't be any real "news" until it goes supersonic and we hear (literally) how much the sonic boom has been reduced when it flies by.
"XB-1 has two tests left on the subsonic roster before going supersonic. This milestone is expected by the end of the year."