Makes sense in some ways. If it is announced as Switch exclusive now, everyone that doesn't like Switch/Nintendo will start shitting on the game or stop paying attention to it. People get salty as hell over Nintendo 3rd party exclusives, eg Bayonetta 2 caused melt downs. If the platform remains a mystery everyone continues to grow interest in it instead of tearing it down because they don't like platform its on.
Makes sense in some ways, but then again, they're gonna have to announce it sooner or later right? Even if the game isn't gonna be done for another year or 2. So at some point you're gonna have to announce platforms, and while I guess the current marketing allows for every option still, it seems like IF they were going for exclusivity you might as well announce that right away.
If it's an exclusive now you're gonna annoy people who got their hopes up after all right?
Anyway I'll reiterate here for Ubisoft's marketing peeps: hello, I want to buy Beyond Good & Evil 2 please with crispy crispy dolla dollaz and I wish to do so on Switch if at all possible. Merci beaucoup!