I just talked to a Saturn rep, and she said there are 4 sets of LATCH/tether anchors in the Outlook, one in each outboard position and only a lap belt in the center. So no boosters in the center. I hope that is not the case for the Traverse.
Like Jenny said, the rep is wrong. All seating positions in the Outlook/Acadia/Enclave & I'd assume the Traverse as well, have lap/shoulder belts. Unless chevy breaks the pattern, at present the outlook, acadia, and enclave are all identical except basically for styling and brand. Physical interior space for passengers, the way the seats flip forward, distance between 2nd and 3rd rows and cargo area are all identical. They all have the same chassis and same engine. But the exterior & interior styling, standard features and options are different between brands. For example, in the Outlook you can only get 2nd row captain chairs if you upgrade to the XR model. You don't have to do that with the acadia...
So anyways, you're likely to see different padding and colors, different overall look, but it's most likely to be the same vehicle.
Oh, and in vehicles with 2nd row bench, there are 2 LATCH and then 2 tethers, for a total of 4 top tethers. 2nd row outboard seats have full LATCH, center of 2nd and 3rd row have only a top tether.
This picture here is a back shot of a radian and you can see how the 3rd row center seatbelt comes down from the ceiling:
http://i5.photobucket.com/albums/y194/snowbird25ca/car seats/radianoutlookinstalls011.jpg
(the 60 portion of the 2nd row was tumbled forward in this picture, and SS1 base is sitting in the MA. For the record, I have to go out and try again, but I'm not sure if the Radian is compatible in the center 3rd row or not. The MA is easily compatible though.
Jen - Can you tell me if the Acadia's 3rd row center position looked like this with the contouring?
http://i5.photobucket.com/albums/y194/snowbird25ca/car seats/radianoutlookinstalls014.jpg