Flybe have put the full Jersey summer schedule on sale now. Good news is that we will have a 2x daily flights to Manchester and 1x on a Sunday from the end of March. Flights from Jersey to Manchester are not available yet, should be soon, but the booking engine shows that the flights arrive at around 09:25 and 18:20 on weekdays, which gives the possibility for a day return.
Flybe will also begin 1x daily Guernsey flights from Manchester and Norwich goes daily from the islands albeit with a combined flight (except on Saturdays when flights are direct).
There may be a few modifications to this but the above does seem to be the basic gist of the changes for the summer.