This is great news. He along with Lauren Graham have undeniable chemistry. So, I'm stoked that he is coming back because the dude is a very good actor. I wish that The Event had a longer run, but if it had to end, better now so we can push Parenthood further. His multiple episode arc though will not signify a return beyond Season 3 as he has signed onto another series in which he is the main lead.

P.S.
I'm still in love with Lauren Graham. Yummy.