My guess is Ao no Kanata no Four Rhythm. This title is still widely popular in Japan with plenty of merchandise, PSVita, NinSwitch and upcoming mobile ports, sequels and sides that are under development (not as of now since they are on an indefinite hiatus due to finacial problems), so is it here in the western side of the globe (us just hoping/begging for a localization group to translate it), making this title a "big title." It also is the largest thread in the requests sub-forum in terms of replies and views.
Sprite/Fairys' Twitter page did mention how they are deciding on bringing Aokana to the western audience, and that we should wait a little while longer.
NekoNyan did mention about how much time and effort it took to obtain the titles, and surely, Sprite is one of those companies that seemed uninterested in they eyes of SP who uses KS safety nets, according to alchemicalhaze on this thread. But, that's SP. The KS safety net method seems to be unpleasant to Sprite.
Not sure about the other title though. My guess is still just speculation.
Edit Sept.1: Huhuhu... It seems I hit bullseye on this prediction.