Barring injury or a substandard season, it's a reasonable assumption that he's going pro early.
Nate Stanley may or may not be pro material, but he's a senior so he's gone regardless. I hope that Petras, Mansell, or Padilla make some noise this spring, and get some meaningful snaps this year.
This past season, the pass protection has been good (but not great), and the run blocking has been stunningly average. This needs to improve if Iowa is going to do any better than 7-8 wins. Defensively I wouldn't be shocked if they took a bit of a step back, at least early on, considering how green it is, but I think it has the makings to be as tough as any Iowa defense late in the season.
And punting, woof. Quit the rugby style kicks and get some stinkin' air under it. There's no excuse, Iowa should average at least 40 yards per punt.