I've looked at Canterbury - seems to operate to Gatwork and Heathrow non-stop to Bristol then Newport and Cardiff (for the date chosen, 2 Apr, there was a not-very-handy 2 hours 25 minute wait at Heathrow for a connection to Reading for the early journey, the evening one does call at Reading but not Newport).
It's actually Swansea to Canterbury.
Other things I have found is Preston gets quite a boost with more trips now towards London via Liverpool. For some bizzare reason though, people using Megabus don't value their time and so Preston to London takes over 8 hours via Liverpool, Warrington, Manchester, Newcastle Under Lyme, Birmingham, Reading and Heathrow. What a long way around. Preston to Manchester via Liverpool and Warrington, one of the most daft things that I have ever seen in my life. Somehow Megabus think this will only take an hour longer, I wonder how quickly they will see that this will actually take much longer?!?!
Other new routes
Strange 1 or 2 trips (day dependant) linking Gatwick, Heathrow and Victoria Coach Station. This direction only though.
Friday-Monday Leeds to Gatwick via Manchester, Birmingham and Heathrow service by Thandi
Friday to Monday Manchester to Gatwick via Coventry and Heathrow operated by Orion
Thursday to Monday Leeds to Portsmouth extra run via Manchester, Birmingham, Oxford and Southampton. Ran by Stotts
Weymouth to London is an extension of the current M3 which will be cut down from 6 trips to 4 and a journey time increase on current sections to be up to 50 minutes longer (despite no change to the route)
Norwich to Birmingham route by Prospect Coaches has changed. It seems to show Norwich to Cardiff via current route to Birmingham then via Bristol to Cardiff. Return suggests Bristol, Swindon, Oxford, Birmingham then as current to Norwich. Bit weird. Norwich to Birmingham does seem to up to 2 per day though rather than 1. Also runs Thursday - Monday
New Leeds to London via Manchester service. Running Thursday-Monday ran by J&B Travel. After being a long time breakdown cover, now they have their own proper run.
A few other random trips appearing but as Megabus don't have proper routes (like NatEx have route numbers and that route does vaugly the same thing each trip, Megabus just makes loads of routes link into one route number. Like the Barnstaple route is M36 southbound from Leeds but M36 northbound to Bradford and doesn't serve Leeds), it's hard to work out a lot of changes.
Operator wise, Stotts, Airsym and Adventure seem to be taking on more work.
Thandi is a new operator to the network plus J&B having a proper run now rather than just breakdown cover.