How often will archeology be expanded on?
If you mean adding a new race, chances are that will be via expansions. POSSIBLY within a patch if the patch merits it. An example being, say, an new dungeon/raid zone popping up where we discover a ancient Trogg city. and bam - now we add Troggs to the Archaeology list of races.
If you mean adding new items? That could be anytime really.
Personally I hope they do add more races, not just ones that merit a new patch. I would love to do some Arakoa or Ogre archaeology without having to wait for a return-to-Outland kind of expansion...
Looking at how professions are playing out in the Beta though, I wouldn't hold my breath. There's a lot of work to be done.
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