Neat. This technique seems to be based on hovering over a tab with the mouse. Power users likely to benefit most from this optimization likely cycle through tabs using ctrl+tab. Is any thought being given to a way to implement the technique for ctrl+tab users?

EDIT: Just spotted the FN saying "Right now, we simply detect whether you’re hovering a tab with a mouse to predict that you’re likely going to choose that, but there are certain more opportunities to introduce warming based on other user behaviours." Hopefully ctrl+tab is one of those behaviors it can be baked into.