NHL Western Conference preview, storylines: Oilers extend Connor McDavid, Mitch Marner makes Vegas debut

Here is a 162-word summary of the news article: The NHL's Western Conference has several key storylines heading into the new season. The biggest news is that superstar Connor McDavid has signed a two-year, $25 million contract extension with the Edmonton Oilers, securing his immediate future with the team. Another notable development is the debut of Mitch Marner with the Vegas Golden Knights. Marner, one of the league's top forwards, was traded to Vegas in the offseason and will look to make an immediate impact with his new team. Beyond these high-profile player moves, the Western Conference is expected to feature fierce competition as teams vie for playoff spots. Perennial contenders like the Colorado Avalanche and Tampa Bay Lightning will aim to maintain their dominance, while up-and-coming squads hope to break through. With exciting talent and compelling storylines, the upcoming NHL season in the Western Conference promises to be captivating for hockey fans.