There isn't a hub now, but there will be. Or, they could probably make a cable that goes from eSATA to Thunderbolt on the other end. Kinda like those mini display port to HDMI adapters. It'll be a little while yet before they pop out, but I would expect OWC to be one of the places to go to find the solution.
Also, Thunderbolt connections are daisy-chainable just like FireWire. Lots of devices will have pass-through ports.
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