While the development teams of both games might like a collaboration, until Sega and SE actually agree to this, I'm liable to take this with a grain of salt. Collaborations between different games in a single company is more likely than a crossover between different intellectual properties owned by separate companies.

Still, if something does come of this, I can just hear all the FFVII fans dying inside and whimpering "WHY U NOT DO FFVII CROSSOVER YOSHI?!"