From the photo at the link upthread: "_up_ to 1tb". The rollout may be a "low end" drive around 64g, or perhaps even a promo drive at 32g, then a range of sizes up to 1tb, probably .25, .5 and 1.0.

As far as capacity goes, like clothes, there are needs for different sizes for different folks

That it does eSATA as well also puts it into a different class of thumb drive.