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Patrick,
That is the expected behavior. Files for a catkin package are no longer installed in a single directory. The place where roscd takes you is a directory containing miscellaneous files for that package, mainly its package.xml.
REP-0122 explains the new layout in detail and the reasons for changing it.
These changes were not made for casual reasons. One of the goals of catkin was to build binary packages that install using the Linux filesystem hierarchy standard. That will be necessary if we ever want to distribute ROS packages through the various Linux distribution channels.
Because the sources are no longer included in binary packages, using roscd to study the packages you use is no longer particularly useful. Instead, you can install the corresponding Debian source package, from which that binary was built.
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