This is a prototype of the T-5 model, a third generation version of the T-3 Manta and an upgrade to the T-4 Mantis.
This model aims to increase stealth by reducing radar signature of the inlets and reduce it's heat signature by changing the exhaust design. Audible signature is also reduced as engine sounds have been brought down by 60%, lowering detection chances by enemy hearing when flying on the deck (yes the engine sounds are actually reduced by 60%).
All control surfaces including pitch, roll and yaw have been assigned to it's two main (and only) wings to further reduce radar signature. This model also features mid-air refueling (AG3).
3rd generation weapons unique only to the T-3's family and her relatives will be added in the near future.