Yes, he did get an invite.
He may get drafted. He's a pretty good athlete and a very good TE. Not particularly flashy in the stats department, and would be next in a near continuous line of Iowa TE's that were drafted. Whether he'll be an All-Pro weapon like Dallas Clark, I don't know, but I do believe he'll at least get a shot at the next level.
And yes, we develop tight ends. I do believe if Reisner gets drafted, he'll be the 7th or 8th straight.