That's right, that's how it is listed now since the upgrade. The reservation number is called the travel plan. In the past, it would be listed as 3 reservations with 3 different reservation numbers and they need to be "linked" together so you have the same room for the entire stay. Now they are listed under the same travel plan so they are like automatically linked together, but you will see 3 separate segments in the confirmation e-mail.
As Chuck pointed out, this also gives you the added benefit of adding dining plan for any of the segments. Or you can choose a different dining plan for each segment (e.g. dining plan for Sun-Thu, no dining plan for Thu-Fri, deluxe dining plan for Fri-Sat).