>>531456237
Yeah, Block 1 is a 4.5th gen with preliminary LO shaping. They're aiming for Block 3 to be a full blown stealth aircraft. They even have cavities for the bays in the Block 1 airframes being produced. Maybe so they can upgrade them in the future, or at least so they can share some tooling.
>>531457349
See above. The flying aircraft are prototypes, but Block 1 is in serial production right now, and they aren't going to be stealthy.