The following video features The Rock's promo from WWE Raw last night. As several readers have noted, it appears as if the photo of the arm notes that has been floating around is possibly a fake, as this video does not appear to reveal any notes. You can see more clearly at the 4:28 minute mark:
Editor's Update: As the commenters below have pointed out, there appears to be a discrepancy between the video below and the live broadcast of Raw. It looks like the video was edited before it was posted on YouTube, as there appear to be visible markings on Rock's arm during the live broadcast.