Yes its true.
It looks like even though the Playstation Store update is tomorrow, the MGO Beta is already available. I myself have a beta key and am going to start downloading it now. I will update this post later when I complete it to tell you how the whole process went.
Mini-Update: It is 741 MB.
Mini-Update: SWEET JESUS! WHERE ARE THE SERVERS, JAPAN?!
It has been ONE EXACT HOUR and its only gotten to 25%. Hold me.
FULL UPDATE: This will be my final update for this post. The next morning it took me about 20 minutes to go from 65% to 100%. There is already a patch available for download in HTTP or Bit torrent. I have yet to download these patches for the fact that Konami's servers are obliterated. When MGO Beta becomes available April 21st I'll give you all the details.