The "Mac OS X for intel leaked" hoax, well, is a hoax.
I've been waiting to post about this, since I thought it'd be a hoax, anyway. And that turned out to be true. However: If the current build of 10.4.1 for intel runs basically on any similarly equipped PC, it certainly could happen that someone creates an ISO of the harddrive or the installer DVD (although there was no talk so far of the devkit including a DVD) that could be illegally shared with other PC users.
So: While this weekend's round of rumours about it being leaked was wrong, it's not totally out of the question that future rumours could be true.