This has been shared in my Chapter 21 review but these are in higher quality.

Here is the cover of Card Captor Sakura Clear Card #4. The theme for this cover is yellow:

© CLAMP・Shigatsu Tsuitachi CO.,LTD. / 講談社

© CLAMP・Shigatsu Tsuitachi CO.,LTD. / 講談社

The limited first edition will come with a set of smartphone goods containing:

• Kero-chan clip type camera lens
• Golden star ring holder
• “Dream Key” ring charm
• Smartphone stickers

Card Captor Sakura Clear Card #4 will be released on March 30. You can pre-order it at Amazon.jp and CD Japan with worldwide shipping.

Source: CLAMP Twitter.