Yeah I noticed mine late last night before finally going to bed (too much adrenaline from being able to order this before bed!). I selected Pebble Blue, but the email said "White" and so did the myorder page.
It's funny because I was ready to call last night and then figured, "Meh, I'm going to put a case on it anyway, who cares? Actually, the white is kind of cool with a black case. I bet it would look better than pebble blue with a black case."
So I just left it alone and was fine with white.
Well this morning I decided to check the forums and saw many others had the same issue, but they were resolved. Checked and sure enough it now says Blue.
People need to realize that "Pebble Blue" appears to be out. They have replaced this with "Metallic Blue." I watched some German video of the guy unboxing to see the difference, and it's pretty significant. It looks much more gray/black than blue. I realize it's a preference thing, but I like the metallic better, so I'm happy. Here's the link where you can see the video on it.
Galaxy S3 Metallic Blue to replace Pebble Blue version?
Anyone have a guess of when Sprint will actually ship these out? Next week sometime? Would be awesome to get it early like my wife did with her iPhone 4S.