Sega put some new Chun-Nan stages down the pipe today for Unleashed, with 4 day stages and 2 night stages for 250 MS points ($3.12), apparently along the lines of a 'hard mode' type thing. I think FKE is planning on doing some videos for us.
It'll be going on the rankings, but I'm leaning against including it in the overall ranking after how little playtime the Sonic06 DLC got and the early poor reception of this batch. Contrary opinions will be entertained.
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The secret area discovered through the werehog wallhax glitch is part of the DLC, so you can take that as evidence of Shamar and Adabat DLC coming later, and probably one for each region.
edit:
Chun-Nan Day 1-2Chun-Nan Night 3The other stages are 2-2, 4 and 5 for the day, and 1-2 and 3 at night. So they're not all as derivative as 1-2 is; the '-2' stages are designed essentially as hard mode variants.