There are many interesting subplots to the upcoming Bruins season, but the most intriguing one is Tyler Seguin.

Simply put, Seguin could be the next superstar in the NHL. After an up-and-down rookie campaign, he exploded out of the gates last season and, though he cooled off considerably, led the Bruins in goals with 29.

He won't turn 21 until the end of the month, and the sky appears to be the limit as he enters his third season. Defenseman Andrew Ference believes his young teammate turned a big corner in 2011-12 and is excited about his prospects for 2013.

"There's that next level," Ference said yesterday at Agganis Arena. "There's that Stamkos level."

He was referring to the Tampa Bay Lightning's 60-goal scorer, Steven Stamkos, perhaps the player to whom Seguin most often is compared. Whether Seguin reaches those heights is another matter, but anyone who has seen him shoot the puck or skate knows he has the tools. That's been evident since he was taken second overall in the 2010 draft, and all indications are that the trajectory should continue upward.

Seguin, who underwent offseason hand surgery, was spectacular during his stint with Biel of the Swiss National League A, racking up 25 goals and 15 assists in 29 games. The Swiss league is not the NHL, to be sure, but according to Ference, the video shows a dominant player.

"Make no doubt about it, it's a different league over there," Ference said. "But if you see the kind of goals he was scoring and the way he was scoring them — he was setting himself up in good position — he was dynamic. He wasn't scoring goals because of weaker competition. He was sniping.