According to THR, Ncuti Gatwa is expected to begin filming the next season of Doctor Who this November.
Whenever Ncuti Gatwa’s Doctor Who tenure officially begin, you’ll be able to watch those stories on BBC America.
Technically speaking though, this means Tennant’s new Doctor would be the Fourteenth Doctor, thus making Gatwa’s Doctor the Fifteenth Doctor.
That said, it appears as though Doctor Who fans ill be waiting quite a while before Gatwa’s Doctor starts getting into wibbley-wobbly, timey-wimey shenanigans.