If I had to guess, I think Treylon Burks is going to be the pick if the Packers stay at #22. He's a big (6'2, 225 lbs), strong receiver who fits the mold of what they typically look for. I personally wouldn't move up for any of the receivers arbitrarily ranked ahead of him. That said, it wouldn't surprise me to see them bypass WR completely tonight if they have a guy or two in mind in the 2nd, or a trade up their sleeve.
Who knows where they are looking at #28? Could be O-line, safety, edge, ILB, D-line? Maybe even another WR?