While Fate/kaleid liner Prisma Illya isn't quite one of those anime that been in development for what seems like forever, it is one that many expected to see scheduled already. Now, the anime looks to be on its way this summer, with preview booklets set to distributed at next weekend's Anime Content Expo.
Silver Link (Baka to Test, C^3) is producing the Shin Oonuma (Baka to Test) directed project.
In the manga, from Fate doujinshi-creator-gone-official Kalmia, a magical girl version of Illyasviel von Einzbern gathers Class Cards. Rin Tohsaka and Gilgamesh are also significant characters, with Shirou Emiya, Sakura Matou,Kiritsugu Emiya and Irisviel von Einzbern around in smaller capacities.
Voices previously attached to the characters from an audio drama include and other Fate-verse works:
Ilya -Mai Kadowaki
Magical Ruby - Naoko Takano
Miyu Edelfelt - Kaori Nazuka
Magical Sapphire - Miyu Matsuki
Kuro - Chiwa Saitō
Rin Tōsaka - Kana Ueda
Luviagelita Edelfelt - Shizuka Itō
The characters you might not know from Fate/Zero and Fate/stay night are the mysterious rival magical girl Miyu Edelfelt and Rin's opposite number, Luviagelita Edelfelt.
Luvia previously appeared in the mainline Fate series, most notably in visual novel Fate/hollow ataraxia, as a classmate/rival of Rin at the Mage's Association academy, Clock Tower. Her specialties include use of a pro-wrestling-like martial art.