EA has announced that they will be hosting the Beta client of Medal of Honor PC version on FileFront. The closed beta of Medal of Honor starts from June 21, however, you can get in on the PC beta through FileFront if you are a Gun Club Member.
However, the file requires you to have a beta key to play, which can be acquired by becoming a Battlefield: Bad Company 2 VIP or joining the Gun Club. The beta key will also be available if you pre-order the game. (Pre-order Medal of Honor)
EA will be releasing the beta client for PS3 and PC users on June 21st. The Xbox 360 beta has been slightly delayed for now.
More info and the Medal of Honor Beta Client download for PC can be found here.