There will, I am sure, be changes like every other negotiation but not a wholesale change of contract that is being proposed for legacy CC. i.e. their current fleets disappear, the type of flying changes from LH or SH to a mix of both, salary structure changes massively, allowances rationalised, ranks disappear. That is what I see as a complete new contract and not just a tweaking of some Ts & Cs.
As far as I am aware there is no proposal to change pilot's salary scales or career path, etc.