The new exhibition level will affect their outfits, yes.
I wouldn't get my hopes up for that in 0.6, at least not at release. It was always supposed to be Rachel-centric, but now we get the bonus of new outfits and the yacht re-design. I doubt he's had much time to do anything else tbh as those are fairly time-consuming. If I had to guess (and it's just that, a guess), I'd say that content-wise 0.6 will be much smaller than 0.5 in terms of new events/progression. On the bright side that re-design was originally planned for 0.7, so doing it now opens up the next update for more story/events... hopefully.