|Concept art from 'Full Metal Panic! Another'|
Shoji Gatoh has been talking about FMP! season 4 and that "it won't be happening any time soon". He also showed some concept art for the Mecha's to be used in FMP!A. You can watch them here:
Additionally the Light Novel cover arts have been revealed. They are identical to those shown in the trailer. You can already pre-order them on amazon.co.jp and other online stores.
Full Metal Panic! Another 1
Full Metal Panic! Seriously dangerous narrow escape from death?
A lot more details regarding FMP!A were mentioned but so far no official english speaking source confirmed them so just check the communitys we usually suggest if you want to know more.