bigger than yorkshire could of course mean a new base bigger than lba
With 1 B733 leaving LBA for GLA, and 1 B733 added to MAN, surely it wont be long until MAN is the largest based (yes my location makes that biased but its certainly heading that way).
If a B767-300 is on the way, Id bet on LBA-SFB and/or MAN-SFB/CUN/BGI.
Its more than likely new B737/757's though.