No sign of flying boom :c
It's a Y-20B MRTT in tanker configuration, and as we can see its landing gear housing is round rather than angled like YY-20A.
Which is to say, technically these images aren't showing us anything new. We've seen Y-20B MRTTs in tanker configurations before.
Whether we will one day see a "YY-20B" with a refuelling boom is a whole other question and at this stage is yet to be considered as on the cards, imo. Putting it another way, a refuelling boom isn't something we should view as "confirmed/expected" for a notional YY-20B.