Following Donna Noble's lengthy absence from an interesting exchange in one of the 60th-anniversary specials now leaves the door open for her return to the show at any time.

Source: https://screenrant.com/doctor-who-donna-noble-catherine-tate-unit-return-hint/

Once Admiral Noble's Imperium warships arrive in orbit around Veldt in search of an insurrectionist cell and demand a share of the harvest from Kora's humble village, it's obvious what will inevitably happen next.

Source: https://www.slashfilm.com/1474891/rebel-moon-ending-explained/