I actually joined these forums for the direct purpose of posting this.
I managed to ding 85 in two days of casual leveling, and have been on the hunt for rares ever since.
So far have been quite lucky with Sambas, Terrorpene, & Ghostcrawler joining my stable. Frustratingly,
with cata less than a week old, accurate information & confirmed coordinates are still a hard thing to
come by.
I was out in vashj'ir early this morning doing a sweep for Mobus, a rare elite who drops a nice 345 BoE
polearm, and I spotted Ghostcrawler scuttling along the bottom back by the abandoned reef. I spammed
in Local, sent out some tells, and decided to watch over him till someone came to tame. Well, nobody
ever came, and over the course of about an hour. I documented his entire pathing from start to finish.
I've heard tales of him de-spawning, and while following him I observed a rather interesting trait.
Over the course of his journey, he will periodically 'phase out' (similar to what Warpstalkers do) and
become completely undetectable/untrackable. However, after 30-33 seconds (I timed it), he will
reappear about 20-30 yards away, still moving in whatever direction he was traveling before he phased.
He does this like clockwork over the course of his journey from start to finish, making him a little
unnerving to follow. If you see him drop off your tracking, start counting, and he should reappear soon.
Using the information I collected, I've created a fairly accurate map:

It's a little low-res (blame photobucket), but it gives a pretty good idea of where he paths. Time period
wise, I generally see him between 1am and 5am. I tamed him earlier this week on the 13th, at about 5:47a
EST, which was 4:47a server.
Hopefully this will help anyone out there still looking for this little guy :3