Around the time of the original NPAS plan last October the 'thinking' was that each unit would fly around 1700 flying hours per year, this would include the 8 to 10 weeks using the allocated spare. So units that currently do around 1400 would carry on at about the same rate and those that do less will actually get to fly, free of local budget restrictions at last!
As for the TUPE topic, it's not simple, but the direct employ pilots will either be TUPE'd into the new setup or be made redundant by their existing employing force. It seems clear that NPAS would not want to take on pilots just to make them redundant the next day, the only issue is who pays the redundancy payment ( the responsibility is with the current employer).