My guess is that it's an LOA (or similar - I don't know what MMA does). My son knew several people who got LOA's from WP before their files were complete and his LOA's also showed up this way at some point. So I would think you had enough in that they offered you an appointment assuming you finished your application (and everything was to their satisfaction) and got a nom. Surprised that you wouldn't have heard about it though by now!
The In Progress just means that you're still waiting like most other candidates right now. I supposed it could be a mistake meant for the wrong academy - you could always contact Larry Mullen at Dodmerb and see what he could fin out for you - but I think they tend to be very careful about making mistakes like that!