There's no doubt that there is more pressure on Wilson this year with the new contract. There's a few things that keep Wilson from being really consistent (and even then for as young as he is, he's still doing pretty well):
Offensive Line: Inconsistent pass blocking leads to inconsistent QB play. I mean, it's not even always consistently bad. So, when Wilson does have time, he's missing a 2nd or 3rd read and people are pointing at it and going "look ! look ! he missed a guy", but the previous three pass plays, somebody got blown up and Wilson didn't have the time he had on that last play. Couple that with the fact that it's not always the same guy: people sing Sweezy's praises all the time, but about 25% of the time, the guy just gets totally blown up in pass pro. Britt was consistently bad, and even Okung has his moments. I honestly don't know how you do it....one play you have 1.5 seconds, the next play you get 4 and you have to figure this all out while watching 4 guys get covered by 5-6 guys and all on the run.
Wilson's style of play doesn't always lend itself to being consistent. On one play, he escapes a jail break and looks like a boss doing it, the next play he thinks he feels pressure and rolls out for no reason instead of climbing the pocket. Like Tical said, it's possible that he relies too much on his athleticism. Which is pretty much the criticism for any athletic QB. He's young, and if we can get some consistent pass protection I think he'll learn from it.
New Receivers: He's getting used to new guys. The only guys he really knows are Baldwin and Kearse, and Kearse is inconsistent himself. I think Graham mitigates some of this, and chemistry works itself in.
His height. Seriously, it will affect him. There are just some things he can't see that a 6'4" guy can. This also lends itself to my 2nd point. Sometimes Wilson is escaping the pocket just to be able to see, I theorize.
The good thing is that you don't get to where Wilson is without being supremely driven. He also doesn't have a problem shouldering blame and responsibility and with his work ethic, he'll most likely always be looking to improve.