I remembered about the Solarwinds demo system so I checked there. Sadly the Message Center trap display is the same there too.
I think I'll put in a feature request to revert back to the summarized trap view in Message Center unless I hear something that convinces me not too.
It's giving you the full trap details, just as you would get from a Trap Alert; instead of the single line that used to be there.
It is more information, in some cases (depending on the device) it may have some useful details. I would suspect this is the precursor to the trap alerts being moved to the web UI and you should see the Trap Viewer app on the Primary Engine start moving to EOL. Just one guy's thoughts.