so any suggestions as to what the new routes are likely to be ?
Depends on what the range will be for the new aircraft.
I don't think the E-Jets have the range but the one route BA would make a alot of money on ex LCY is DME. BA carry alot of customers on the LHR/DME that are in the banking business. LCY would cut out around 2-3 hours off there journey time.
That route a side any of the following routes would probably do well as BA have a large number of corperate account in those cities
DUS,
HAM,
STR,
OSL,
ARN,
HEL,
LIN ( 2 flights a day and would be much more popular than the failed MXP was)
I also reckon they will try and add another leisure route or two. If the aircraft has the range AGP and FAO would be well recieved and used by those who work in the city and go down there for golf weekends etc. Other possible leisure routes PRG, BUD, VCE, and FCO.