This won't cause any "reload" issues, like the ones we were experiencing on mobile browsers not too long ago, will it? Because that would be quite annoying. So Google needs to be careful about how aggressively it intends to implement this. I don't want to see every other "older" tab reload when I click on it. Perhaps reloading the oldest 10% or 20% of the tabs would be fine, but I wouldn't go any further, and they need to do user testing even for those percentages.

It sounds like they're not unloading tabs, just suspending them. So the tab will still be loaded when it's in the background, it just won't be able to consume any CPU resources because it's suspended.