Google Review Error, Or New Feature?

Do any search on Google with “review:” in it and you get a 503 error. Search for “review:“, “review: spider-man 3“, or “google review:“, doesn’t matter, it just fails. What could it mean? Is there some sort of error in Google, or are they revamping/expanding their movie review aggregation feature? Only ridiculous and unfounded speculation will find an answer.
Found by Henry, via Digg.

Original post by Nathan Weinberg