For me it is too early to say, my battery consumption seems slightly increased, but that can be because now with UI changes I really like to play with my Jolla and show it to people around
Also now e-mail sync seem work more or less according to schedule, so in my case it checks 2xIMAP every 5 minutes and 1xExchange always up to date. When previously I doubt if auto sync was done more than 3 times per day.
I will continue monitoring.