Revision 8 of SAM V71 Xplained Ultra has engineering samples mounted with part number ATSAMV71Q21A-AAB-ES2 or ATSAMV71Q21A-AAB-ES3.
Revision 8 of SAM V71 Xplained Ultra uses PCB (A08-2216) revision 3.
Revision 8 of SAM V71 Xplained Ultra fixes the issues described in Revision 6.