The New Patch Nerfed Leap Slam

The DPS of leap slam didn't change, the character screen calculation was corrected so it displays correct DPS.

Previously all attacks calculated attacks per second, and therefore DPS, assuming that the attack took the duration specified by the weapon (which most attacks do).
Leap Slam (and a select few other attacks) instead have their own base attack time, which overrides the one from the weapon - this is now correctly accounted for in the character sheet.

The actual DPS did not change other than the reduction in speed already mentioned in this thread, to my knowledge (although it's possible there was a separate change made to that as well that I'm not aware of, that would almost certainly have been specifically called out in patch notes).