Video Playthroughs:
148Apps: 21 minutes, No commentary
App Spy: 9 minutes, commentary

Previews:
Gamezebo: Hands-On Preview
Eurogamer: Video: a first ride on the free-to-play Trials Frontier
148Apps.com: It Came From Canada
iPhonesoft.fr: Preview (French)
Vandal.ex: First Impressions (Spanish)
Sosiaalisesti Rajoittuneet: Review (Finnish)

Other Discussions:
Touch Arcade

Pre-Launch Coverage
Gamespot Preview
Polygon Interview