The unique Secret Card is actually the "Sakura and Sakura" card, and here's a little preview of how it looks like (click to enlarge):
Sorry about the quality, got these from Yahoo Auctions and so far is the best I could find ^^"
Cute illustration nonetheless, isn't it? ^^
The 6 (and not 4 as I had previously reported) cards listed as Ultra Cards are:
- I want to be strong
- The shop that grant wishes
- Torn Heart
- CLAMP in CARDLAND
The 2nd and 3rd Series of CLAMP in CARDLAND are reportedly due to February and May 2008, respectively.