Doctor Who confirms return for Jo Martin's Fugitive Doctor in all-new "storytelling experience" for UNIT adventures

They seem to be pushing UNIT in advance of "The War Between the Land and the Sea" - that's my best guess.

I think they did something similar in the Whitaker era (which I did not participate in).

Best case, it'll be something to keep the series' profile up while they figure out what's next...

From the sounds of it, what it is is "expensive".