This isn't actually new — there are extensions that will perform a similar function — but it is the sort of thing I'd rather see built into the actual browser, rather than an extension.
I tend to have a lot of tabs open. I'll confess one backhanded reason I like Chrome vs Firefox is that it will squeeze the tabs down until the site favicon vanishes, at which point I know I need to start closing tabs. This won't solve that problem, but it should take the pain out of having lots of tabs open for quite some time. I look forward to it rolling into production.
Chrome tests “discarding” background tabs to save memory
Chrome nightly builds on Windows and Mac OS can suspend tabs, but keep the data.
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I've been using the Great Suspender extension and it's made a huge difference in my performance. I used to have to reboot my Chromebook daily under the crush of tabs, but now it's maybe weekly.