Can I mention 2 points with regards to the United service Manchester/Newark.
Firstly the latest ACL report for Winter 20 still shows the airline as holding slots for a daily service. There is no mention of United in the comments section, however this is because there is no change from the details for W19.
Secondly a reliable source has advised that United are still finalising their plans for the winter. Let's leave the guessing until the truth is known.