new models?

where can i get new character models and who do i swap them with

you dont. The new models arent released, and wont be until 1.3. They only way to get them would be to bribe a team member =P *cough*...

www.esf-world.com

Its the best esf file server(in my opinion).

Just dl the models then replace the .mdl of the desired character.
You can find the charater models : steam/steamapps/youremail/halflife/esf/models/player... i think.
back up your originals though.