enigmairidescentFUZZI've always got the feeling, from the leaks and rumours I've followed, that it's going to be something between a simple port and a completely new game. So in other words, I doubt they'll redesign the game from the ground up, but will probably use the existing style, concept art and assets to improve on character detail, shaders, lighting, textures, particles.
they're not porting the game to source2
source: tf2 team in person
That's your source? Just "Tf2 team in person"? Do you have any legitimate information?