It looks to use the same stand as the new aluminum LCD monitors, which don't appear to be height adjustable, so I'd guess the iMac no longer is, either.

The ports are near the right edge (as you look at the screen from the front) in the back (not on the side). About 1" from the edge and centered top to bottom more or less. The power button is below them. I don't particularly like the arrangement personally, but I could live with it.