Was chatting to the Sqn Ldr who works in the NEM area at AIR, last week, about the transitional aspects in the new engagement structures. Basically 2 IBNs about to go live. One details (as much as they can at this stage) the new structures from 1 Apr 15 and the other the details about the alignment offers to get a whole bunch of SP to LOS 12 (about 10000 people).
The LOS 12 bit is being done now because they have the authority in existing structures to go with it. A team have been stood up to manage the process of getting the letters out (similar to the EDP extensions) and the unit clerks are going to AIR this week to get the in brief. Apparently there is a big push on this element as they need to get a whole load of offers out there before August so they can inform the training targets for 2015.
The new engagements they hope to offer to everyone where it is favourable for the individual in the Autumn - they have to wait until Parliament approves the structures in the Summer - so, for example, if you commissioned after age 25+, and now a Sqn Ldr, then you get offered LOS 30 (the new structure) as it will be more favourable. There are about a dozen nuances they are looking to action across all ranks.
As for age 60 - they aren't expecting to offer this (to the current cadre of SP) until at least late next year as there is some considerable modelling to do in order to get this right. Too many offers and it could log jam promotion flows for some time.
The impression I get is that the NEM team are working really hard to try and get the best deal they can for the Air Force, despite some severe obstacles (for example he is the only one in the team at the moment which just seems mad to me).