To be honest, I believe people are setting their expectations waaaay too high on W10, especially for phones. Maybe it's because I'm very pessimistic when it comes to stuff like this. Hopefully it brings unison to Windows devices as it claims. I really want to see what's new to phones. Hopefully it is epic.
Mark my words, if nothing is truly given--like the preview for W10-- in this event on January 21, or a rollout date (even a quarter) is given and people don't get it exactly at that rollout date.... it's gonna be mayhem in the forums and in every article of WC. Sad how this happens ALL the time with WP.