Yeah, I'm being cautious, as "small amount of summons" means that we might only get the most iconic ones. It could be like FF XIII, though, no? Having non-gameplay summons. Although I don't know, considering how tied they seem to be in regards to this universe.
Which makes me remember that XIII actually had designs of Diabolos, although he didn't make it. Can't wait for the Ultimania for XV.
I just want to see his attack in glorious Luminous visuals