So as previously mentioned I got a an offer last year so I have a bit of contact with the office which sends out the contracts (DMILC7). I got in touch with them and was told offers won't be send out until 12-April-2012. Now based on my experience last year, you'll get an acceptance letter first then within a month - 3 months you'll get your terms of service which has the actual details like where you will be going, for how long, you pay grade, rank, etc.