In case you don't know, the tour is a social event where you can participate in cooperative hunting activities, time attack arena challenges, and more. (nintendowire.com)
This change opens up a lot more fun activities to find, such as side missions, races, competitive battle arena challenges, character creation tools etc.. (heavy.com)
As a side note, there's also a new arena Challenge Quest called «Gale & Fangs Slay Event 1», which will be available until May 24th. (twingalaxies.com)