EZY winter timetable is out and has some timing changes but also some missed days for routes such as Paris, Rome, Nice and Budapest. Could this be new routes for winter in addition to those expected by the arrival of the new aircraft?
BRS and EMA (and possibly others, I haven't checked) also have days missing on some routes that in previous winters ran daily. Some of these days seem to be missing from December to early February.
It maybe that this is a cost-cutting exercise by easyJet, preferring to keep the a/c on the ground in the traditionally poor time of the year for loads in the UK aviation industry, rather than send them out lightly loaded on the days of the week that experience has presumably told them are the worst days for business on a particular route.