I'd be suprised if there's any recruitment till lufthansa decide what to do with bmi. If they decide to sell slots off then bmi will be very overcrewed any pilots could go ( but IMHO I think this is unlikely).
In term of the MAN LH being moved down to LHR it should have minimal impact on pilot nummbers as the pilots operating MAN were LHR based. Depending on the rotations of the AMM and CAI and the difference in crew required bmi maybe slightly over crewed on these. It would be a fair assumption that the AMM will still be a layover and that the CAI would change to a layover as it is currently on flight duty limits and the length of turn around time required for the A330 is significantly more than the A320/1.