Speaking as a recent appendee to the bottom of the BA list (i.e. CFE), it looks to me as if the whole thing is going the way of the US major/regionals.
Northwest/Mesaba... AA/American Eagle... BA/BA CitiExpress.
I reckon there will be a scope clause with BALPA that will restrict CitiExpress to a max of 70 or so seats, and maybe some kind of deal allowing transfer into mainline at some stage.
At CFE, despite some resistance to being tagged on the bottom of the mainline list (mostly from me - but it's all in the past now), there was some concern that we would end up part of the CitiExpress set up instead. We have, thank goodness, made it onto the right side of the divide, albeit at the bottom. To any BACC BALPA reps reading this... Thanks for that at least - now how about my 30% pay rise in Jan?