The weather is 40 degrees warmer, Doug Pederson is gone, Carson Wentz is gone and Zach Ertz is not gone.
And with all of these knowns come so many unknowns. We have no idea if Jalen Hurts is up to the task of leading this football team, even though he has been voted a captain, and seems to have won over his teammates and coaches.
We have no idea what a Sirianni-coached team is going to look like.
Sirianni said he's hoping for this: "I want them to see a tough team that gives everything they got, that's fundamentally sound, that fights for each other, that's accountable."
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So what's a successful season? Are we judging that on wins and losses? The over/under for wins in Vegas for the Birds is 7. So if they go 8-9, do we deem that a success?
Is a solid season from Hurts at quarterback low turnovers and the ability to stay healthy? Signs that he has the potential to be a franchise guy?
Or how about Sirianni? Think of this: in Andy Reid's first season, the team went 5-11, and he is unequivocally a successful NFL head coach.
In Doug Pederson's first year in Philadelphia he went 7-9, missing the playoffs. But he of course eventually won a Super Bowl.
And going way back, in Dick Vermeil's first year - and at the same age as Sirianni and also without ever having coached an NFL game like Pederson and Reid - he went 4-10. Vermeil is now headed to the Hall of Fame.
So what will success look like with Sirianni?
So many what ifs, but most exciting is this certainty: we have real football to talk about once again.