Hatsune Miku: Project Diva Extend is a Sega game, so I get how it's possible that Valkyria Chronicles and Virtua Fighter likenesses could be in the game. It feels kind of dirty to see this tie-in, but if you're a fellow Sega whore you won't be too bothered. Besides, they're cute. 

Siliconera says that among the modules Sega has shown off recently are ones from Valkyria Chronicles and Virtua Fighter. Though I'll probably never play the game, I like the Kage-Maru one.

These join others from Phantasy Star 2 Portable: Infinity and Shining Hearts. 

For Project Diva fans, this is a nice bit to look forward to. To Valkyria Chronicles fans this is a painful reminder that we're not playing the third game.