I've been seeing it more often (off and on) for a couple of weeks now. Like everyday I'm seeing it maybe 40% of the time I use the website. It seems more often then not when you're first not signed it, at least for me.

I first noticed it a couple of months back but it was maybe a couple of times a week max back then. I'm not a fan but also because I don't think it's supposed to have rolled out so there are some bugs I find. For example when I change currency on the hotel listing page and then click through to a hotel the curency goes back to default.

It looks sleeker and to be honest it loads faster but that currency thing is an issue for me atm so I exit Chrome and go back in and hope it gives me old UI.