Seen someone has leaked them, also to note the 33/33A is missing aswell as the W3, K1, K2, 333, 359, 13, M71 so can assume they're all withdrawn / replaced (rumoured Q3 for the former).

The 19 replacing the Northern section of the 359. It does the X7 route between Seghill and top end of Delaval, assuming it's a future proof route for the B&T railway if it comes. It's also nice to see it connects with the Metro 7 minutes before it's due to depart / arrives in both directions compared to the current situation where the Metro pulls in and the Bus pulls out.
The 335 is dropped to hourly via Murton replacing the other section.
The W1 is replacing the section of W3 over the bridge.
The 335 is also extended to Killingworth replacing the K1/K2.
The 342 is replacing the M71.
The 76 is the 13.
The 75 is to 'keep links between Throckley and West Denton' so seems the 71 is gone.

Also whoever asked the M6 is just the current 6 not sure why the renumber.