I didn't notice it until I was told, but this month's Arcadia magazine (the successor to Gamest magazine) comments that the new "mystery girl" in that Nakoruru gal game will also be in Capcom vs SNK 2. I missed the info since it was written in a section dedicated to Samurai Shodown, totally unrelated to CvS2. It may be a misprint, or Capcom may have missed it during pre-print checking due to the same reason. The short introduction sentence to the mystery girl says-

"The latest character in the world of Samurai [Shodown], created by character designer Senri Kita. [The character] will appear in "Nakoruru -Ano hito kara no okurimono", and "Capcom vs SNK2".

While Arcadia is a respected magazine, this short introduction may be erratic; a "Typo" for the upcoming "SNK vs Capcom 2" for the NeoGeo Pocket Color (the card game). Logically considering that she's a no-name character from an adventure game, this is more likely. But if it's not a typo, I'm not sure if she'll be a playable character, or another character making a cameo.
-H. Moriarty