The new iteration is called Advantage360, has contoured key wells (of course), and is fully split (omg, omg)! Kinesis is looking for feedback to finalize some details (link in their facebook post).
My biggest complaint about the Advantage is the placement of the arrow keys in the bottom row. I never got used to them (and I sometimes use vi with a Dvorak layout). I hit them by accident far more often than on purpose. From the survey, it appears to me that they are still in approximately the same location.