I recently searched the web and came across an individual claiming that his friend was in the beta. I'm aware that dawnguard had a beta, but I didn't see any info of a beta on the main bethesda site for dragonborn.

Yes, there is a beta.

It is a closed beta. Other than saying there is a beta, there shouldn't be any information out. The people participating had to do the nda stuff.

Anyone who starts spreading information could possibly get his friend dumped from the beta, and end up with their forum account suspended until after the dlc releases.