just ignore it man
IW haven't annouced they are making beta yet (as far as i know)
plus i doubt IW have made a PSN id/gamertag/wii equivalent just to message random people saying they have been selected for a beta
if you want a beta best thing you can do is sgn up to IW's forums AND callofduty.com
when CO
WAW came out i got the beta code for 360 and pc from callofduty.com