I feel like going over all the positions so here we go!
QB: The battle is can they show off Hundley enough to get a team to offer up a high draft pick after training camp (doubt it) or next off season (more likely)... and how does Callahan look... can he be a long term back-up? (which I'm assuming yes, otherwise they wouldn't be thinking about trading Hundley).
RB: Wide open battle after Monty.
FB: Rip and then everyone else.
TE: Battle for #2 TE
WR: Battle for #4 WR and battle to keep 7 WRs on the roster again. Also on a smaller note, a battle for who the WRs will be in two WR sets. Also battle for STs roles.
C: Can anyone challenge Barclay for the #2 center spot or is Barclay a lock?
OG: RG position and future of both starting OGs positions as a lot of guys are in contract years at OG.
OT: None in my mind
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NT: Clark has taken the starting role... but who's the back-up? Jean Francois? Guion?
DE: I'm thinking Lowry could have the outside 3-4 DE spot locked up, but the interior rotation and who they're going to use in Peppers/Datone DL snaps... most likely Lowry and Adams with some Jean Francois too.
OLB: What's the back-up order? Who's gonna win the 6th OLB spot?
ILB: Of Ryan, Thomas and Martinez... who's not going to start? And can a 4th ILB make it? (I'm guessing no because of the Safeties will be getting more time in a S/LB hybrid role)
CB: Everything! Who starts to who's the 6th CB (Waters? Hawkins?)
S: How much will they play in the S/LB hybrid role and how ready is Brice and Jones.
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K: None, Crosby for the win
P: Everything including other teams... like last year... in theory our season punter could currently be on another team right now.
LS: Can Hart make the coaches forget about Goode, or will they be signing Goode after the 53 man roster cut down.