According to CVG earlier
We've just had some amazing news... we can't quite tell you what it is yet, but keep em peeled on CVG in the next few days for a huge opportunity to get early hands on with one of the biggest games of this or any other year... let your speculations commence...
This line seems to be the most important one id say 'one of the biggest games of this or any other year'.
Normally they would say keep your eyes peeled this afternoon not 'in the next few days' so I dont know if the reveal was actually Borderlands 2 because it was only the release date that was new info, we all knew it was coming this year. Unless both publications are talking about something entirely different of course.