The new modes were teased via a series of videos and screenshots on Twitter last week.
Titled '3-2-1 Go', the online head-to-head mode allows players to compete against five rivals simultaneously in 'Race It' and 'Trick It' events.
As the video suggests, the helicopter acts as a game lobby, with events starting once at least one other player joins the party.
In another twist, 'Trick It' events introduce a timer, meaning that in order to win, players must post the highest score and cross the finish line before it reaches zero.
Freeride, meanwhile, features no rules, no ghosts, no clock, no score and no other riders. Once users cross the finish line, they can repeat the course instantly under the same rules.
The patch also contains a number of fixes, eliminating issues with large amounts of Geotags and credits, improving menu speeds for popular players and introducing an update information feature.
The SSX franchise reboot features various real-world mountain ranges, as well as a brand new survival mode.
Previous DLC includes the Mt Eddie range and the classic character pack, the latter of which adds seven characters from SSX 3 and Tricky.
The game's soundtrack features the likes of Run-DMC, Skrillex, DJ Shadow and Foster the People.
SSX was released on February 28 in North America and March 2 in Europe. It is available for the PS3 and Xbox 360.
> Read Digital Spy's SSX review
Gallery - view SSX screens below: