To a lesser degree we are starting to see a similar post of article starting with Opera, Safari, and IE working on reducing their energy usage while oddly it is Chrome that is silent. Just like before a product with a significantly superior feature has caused me to switched. But this time it was back to Safari from Chrome. But the Chrome team is not asleep at the wheel like the Microsoft was and I am expecting/hoping within a year or two there to be a post with dramatic energy savings made by the Chrome team.
I personally don't think chrome has anything "up their sleeve". From the looks of what they have been focusing on recently, they really dug themselves a hole with their technical debt in the V8 engine.
It's too complicated, and it looks like their upgrade path has it getting worse before it gets better. They aren't planning on switching to "Ignition -> Turbofan" until mid-late 2017 (which is expected to reduce memory usage, but also will reduce speed slightly at first), so that means that until then, it will be "Fullcodegen -> crankshaft or turbofan and sometimes ignition only in some codepaths". It's only getting more complicated as they try to write out their crankshaft compiler. IIRC ignition can't interface with cranshaft, while it can with turbofan, but turbofan is significantly slower than cranshaft for many things right now, and fullcodegen is WAY to slow in parsing (and re-parsing, and re-re-parsing) code to compete with Chakra which just starts SOO much faster because of that.
I hope they prove me wrong, but my hopes aren't high at this time.
But umm... they don't really do that, right?