I wonder why they've not just planned three through platforms, with the middle one as the 'bay'? Maybe so as not to disrupt the through lines as much, possibly.
From the consultation thingy - the service pattern:
-----------
3) The initial off peak hourly service pattern that is planned is:
Southbound Services
Kings Lynn - London Kings Cross 1
Ely - London Kings Cross 1
Cambridge Science Park - London Liverpool Street 1
Norwich - Cambridge 1
Northbound Services
London Kings Cross - Kings Lynn 1
London Kings Cross - Ely 1
London Liverpool Street - Cambridge Science Park 1
Cambridge - Norwich 1
It is likely that Birmingham New Street - Stansted Airport services will also serve Cambridge Science Park.
-----------
I think the Ely - KX service must be an extension of the Cambridge fast, which is interesting. Quite good service overall, especially if it did get the XC too.
Definitely time to try to get the Norwich train into Stansted, I think.