I'm on Team Cautious as well...

I've asked before how long the pre-ordering would be open, so there would hopefully be something palatable by the end of said window, enticing enough to make me throw my money at the proverbial screen.

Since I've got no answer on that specific matter, I did pre-order the Pro1, if only to show my interest.
Ultimately, though, I'm very unlikely to actually buy it if there's no full-fledged proper non-android OS available at some point.

I'd rather miss the opportunity of getting the Pro1 than ending with a device I won't be able to use as it was advertised and perceived by my anti-Google self.