CineStill has released 120 format negative film in both the 800T and 50D emulsions. It is available direct from Cinestill and Adorama is also carrying the new format as of writing.
The film can be processed in C-41 or ECN-2 chemistry and pushed up to 3 stops. It gets rather contrasty at ISO 3200, apparently. The material should be used within one year of manufacture to preserve latent image latitude and colour fidelity.
List price is $12 a roll. Other formats sold are the original 35mm still format, 16mm movie format and Super 8 format.