STATE COLLEGE, Pa. -- Bill O'Brien's voice will soon regularly echo across the practice field. Allen Robinson will soon continue cementing his legacy as one of PSU's best. And Deion Barnes will, once again, soon start giving quarterbacks a case of happy feet.

Monday marks the start of training camp and a new season, which comes on the heels of one of the most memorable performances in school history. PSU shocked the nation with a gutsy 8-4 record last season ... but that was last season.

The Nittany Lions are trying to take another step forward in 2013, and it won't be easy. The limited roster has its fair share of question marks, so NittanyNation's outlined a few of the bigger ones:

Who will become the QB, and can he succeed?

It's a two-man race between Christian Hackenberg and Tyler Ferguson -- and Ferguson, the juco signal-caller, didn't do himself any favors. He missed about a month of voluntary workouts, so he's going to have to get re-acclimated ASAP.

O'Brien tried to downplay Ferguson's absence, but safety Malcolm Willis spoke candidly at the Big Ten media days: "If it was me, I would have trouble picking things back up and just being away from the team."

Few analysts are betting against the fresh-faced rookie, in Hackenberg, to start. He was the top-rated quarterback in his class, the 15th-best prospect in the nation, and he's eyeing immediate playing time. O'Brien insisted starting a true freshman like Hackenberg would not be unusual, and it looks a lot better for Hackenberg than it did a month ago.

It's an open competition, and O'Brien hoped to name a starter midway through camp. But whoever takes over isn't going to have an easy time. Sure, Matt McGloin picked up a complex offense in a short period of time -- but he was used to facing Big Ten defenses and digesting college-level playbooks. His touchdown-interception ratio (24:5) was one of the best in PSU history, and it would be hard for even an experienced quarterback to match those numbers.

Quarterback is really the only question mark on this offense. But it's a big one. If PSU succeeds here, it doesn't just bode well for 2013 -- it gives fans hope for 2014, 2015 and 2016. This is the biggest storyline on the team, and it's one that will be watched closely all season.

Can this front seven match last year's performance?

Michael Mauti and Gerald Hodges formed the best LB tandem in the conference and one of the best in the nation last season. PSU was the lone school to place two linebackers on the semifinalist list for the Butkus Award. And Jordan Hill was an All-Big Ten player who dominated the season finale in a fashion that few defensive tackles have done before.

Those three key players are gone, and it's really not up for debate whether this front seven will be as good as last year. It won't ... but just how good can it be? Players like MLB Glenn Carson and OG John Urschel have pointed to LB Mike Hull as the guy who's impressed them the most this offseason. He's been a staple of any "Players poised to break out" lists, and he'll be carrying a full-time workload this season as opposed to situational playing time.

Hull is a special player, but the young LB lining up on the other side of the field is where the concerns start. Nyeem Wartman made an early mark last season with a big punt block but was lost for the year just one week later. Defensive tackle is also a huge concern without Hill. Big things are expected out of DaQuan Jones, whom Gil Brandt named as the top senior DT in the country, but Kyle Baublitz and Austin Johnson will be taking on a much bigger role this season. Johnson has potential, but it's not yet known if either player will be a force in 2013.

How will PSU counter the depth issues?

Get used to this question because it'll be asked until the sanctions finally end. O'Brien wants to lessen some of the hitting in practice, and he's often said he boasts a "next man up" philosophy. When someone goes down, there's no hesitation -- that next player has to and will be ready.

That's a nice philosophy to have, but there are just key areas on this team that can ill afford injuries of any type -- such as linebacker, quarterback and defensive tackle. (Without Brad Bars, PSU has just one experienced backup DE in Anthony Zettel. Ditto at LB in Ben Kline.) There are some run-ons to choose from and a class of 16 recruits, but it's no secret that the overall quality of this team will suffer with each and every injury at those key places.

O'Brien was able to keep his players fresh in the trenches with a nice rotation last season, and it wouldn't be a big surprise if some players -- such as DT Jones -- sit out in, say, the fourth quarter of the Eastern Michigan contest. Also, there's a good chance fans won't see too many Wisconsin repeats this year -- where Zach Zwinak carries the ball 36 times.

There's only so much O'Brien and Co. can do here, though. Ultimately, a lot of it comes down to preparing the players and then just crossing fingers and hoping everyone stays healthy. A healthy Penn State could become a BCS buster; an unhealthy Penn State could struggle getting past .500.