I'm excited (probably because the three characters we've seen so far doesn't give me the impression that this is appealing to the "otaku" side of the fanbase, lack of a better term), but at the same time if they split the game off into three separate parts (Because of the three royals and the name) and I have to buy all three of them due to the success of Fates, I'm going to be extremely disappointed in IS. Not full on raging and rioting with everything I own Fire Emblem burning behind me, just really disappointed.
It's also pretty early to say, because most of the information we have about the game has been pretty quiet. We haven't really gotten anything since E3, and even then that took around a year and a half since the last time we had information on it (the mere announcement that it was, indeed, a thing, on the Switch, coming 2018 way back in early 2017).