When someone says they are adding more to something I take it to mean there are already some of that thing. So if Fujino says he is adding 5 more CGs I take that to mean he has already made at least one CG for that event. Also I am assuming those TWO preview pics are part of the five new CGs.
Fair enough. I'm going to temper my expectation and just assume the Asuna POV is 5 CGs only because I don't really know why Fujino would probably need more than 5 CGs for an anal scene I think? I could see more if they for whatever reason decide to go beyond it and Asuna accidentally ends up having sex in-game to screw over the ritual.
If not that then having more than 5 CGs would probably just be more BJ related stuff I guess.
Edit: We can assume which 4 CGs are being used based off the shadows. Teasing, Rubbing dick on ass, first pose (CI-EN preview), 2nd pose (Patreon Preview). So there's only one left and that just might be the finished scene so I don't know.