As far the WR, they always bring in guys around camp that are released. I'm sure he is a long shot, but the scouts must see something in him, and want to give him an opportunity. Competition is good, not bad.
As far as the Tackle, I saw that in the paper. My take is that this means that they are more convinced that Wand will be the starting LT. If Wand starts, they don't really have an experienced true tackle as a backup. Not sure he is a lock to make the roster, but they might consider using him as a backup at RT and LT, instead of trying to swing Pitts and Weigert from the guard spots out to tackle. He's also a very experienced vet, and may be able to share some tricks of the trade with the young guys. I see it as a major plus.
Of course, I may not count since I'm not Vinny, AJ, or CND