i soooooo wanna try out the beta!
I wouldn't mind if it did share a cooldown. Seems like most of the things in Archaeology are just cosmetic, and I'd love it even if all it did was change the HS graphic up a bit, tired of the nature-spell thing now...D:
Even if it does share a CD, id use this item over the regular hearthstone.
I highly doubt it's a separate CD since you can already get your hearth down to 15 mins via guild perks.