I don't know if anyone else has seen this, but Motor Trend did an article a couple years ago that I just recently found. It's probably the only 5th Gen concept I've seen that didn't jump on the "retro" bandwagon, which the 5th gen was never going to be anyway. I think this would be closer to an actual production car then, say, Kris Horton's imaginings.
Without further ado, here is the 5th gen Camaro:
I also did some slight tweaking to the drawing to create a Z28 model. I'm not the greatest with photoshop, but i touched up the areas I thought needed some help (the grille, headlights, and taillights.) I also added some black stripes, a la the classic Hugger Orange/Black paint scheme, and a Chevy emblem to the grille.