An information page has been added to the official site with some more details on the Kiddy girl-and pure (キディ・ガーランド ぴゅあ) manga due to start serialization in the May issue of Comp Ace (due out on the 26th of this month). While the story is to be written by Kimura Hidefumi the artist they have tapped this time is Yukari Higa (緋賀ゆかり), who also drew the Shina Dark manga. The image below is taken from the official site, and I for one think it works very well. She's also included a B&W illustration in this blog entry on her own site, Highway Star. For reference, she also has a pixiv account. Since Tweedledee and Tweedledum are also in the image it's possible their return is still on the cards.
--update 2009/03/03 12:50 GMT--
Adding some links that have appeared since I created this entry. As usual I will keep adding anything useful until I start a new entry.
--update 2009/03/04 01:15 GMT--
The artist has added a slightly larger version of the above colour illustration to her site.
It isn't worth a new entry (unless anything new crops up I'll start the next one when I have the manga in my hands) but there's a new entry on the official site's information page. Apart from some new art (and it looks like exploding candy is still on the cards) the only thing new that I can make out is the title of the first chapter, "Girl Meets Girl" (がーる・meets・がーる).
Kiddy Girl-and (Hillbilly Otaku)
New Wallpapers! (itspudding.com)
Kiddy Grade Continues With Kiddy Girl-and (Animekon)
Kiddy Grade spin-off Kiddy Girl-and announced (Anime Sanction)
The loli stampede continues - Strike Witches 2 + Kiddy Girl-and (Moon Speak)
Kyoto Animation's Munto TV Anime Adapted into Manga (ANN - it's tacked on the end)
New Wallpaper: Kiddy Girl-and (again) (itspudding.com)
Kiddy Girl-and announced (Mognet Central)
Kiddy Grade Spinoff Kiddy Girl-and Announced (Toon Zone anime forum)
Kiddy Grade Spinoff Gets Green Light (animevision)