To me, Hydro Thunder was always about violent rumble action and making boat racing even more over the top than it naturally is. Vector Unit seems to agree -- it's working on add-on content for October that is about "ratcheting up the level of insanity," according to creative director Matt Small.
The appropriately titled "Tempest Pack" for Hydro Thunder Hurricane introduces the following:
The pricing and exact date have yet to be determined. Maybe they're waiting to see our reaction before slapping a number on this? Who knows.