This fight is a mismatch at heavyweight guys. If you're asking Roy Jones at 193 pounds to fight a heavyweight who's much bigger than him and fast too... that's unfair and Haye probably wins. Jones did start his career at 154 remember! However I would say that at 190 pounds Jones probably wins a UD over Haye.
Agreed, his overrall speed is getting overrated. His speed is mostly in his reflexes, and he has good, quick movement if a little off balance at times. However Haye's speed can be deceptive, his straight right is a very fast punch, he doesn't often flurry and show off mad speed like Jones or Calzaghe do for example, but it is there to an extent. He has good speed for a HW, possibly the fastest out there, but not by a lot, and its not superb overall. But the danger with Haye lies a lot in the speed of that right hand, iwhich I think is exceptionally quick and well timed. It is delivered with a lot of speed, venom and great accuracy, and thats where his chances lie on June 20th.