Ok so I still this McAllister is RJ, see my theory here

http://www.whoisredjohn.com/See-a-theory-Red-John/11950

but the voice in the video does not sound like McAllister.

I think it sounds like Dr. Linus Wagner from the pilot.

Listen to his voice from S3 at 19:00
http://www.videoweed.es/file/6142a7729bcb8

Also his hairline and facial profile match the man in the promo

http://imgur.com/WghA6UQ