For some things, this is more useful than others. If you’ve seen the fight against Poharan before, this is not only not elucidating but specifically unhelpful, as the preview is more concerned about what the event adds after you beat her (a new merchant!) than how to beat her. On the other hand, seeing the pattern selection options in the tailor shop are going to help anyone curious about how the feature will expand player costume options. Check out the both videos below, although fair warning: Don’t start watching if your boss is walking over.
Source: YouTube. Cheers, Rafael!