Looks like nothing new is coming in Patch 4.3
Below is what we know from Blizzcon 2011.
Q: Archaeology has been ignored other than a few added things. Are we going to see anything cooler, better vanity items–lower than max level heirlooms of more variety?
A: Archaeology is eclectic and we love it. We want to sex it up and and make it more fun, add more things. Things like a flare gun we fire and you get ported to a dig site. Random encounters like a Mummy spawning with extra fragments. Maybe arch dailies. We do want to make this better for MoP.