io.js made a lot of noise about this, and has reached a "compromise" position that is indistinguishable to the end-user - or is LTS going to take V8 version bump over its 2.5-year life?
No?
Then take your scare quotes and bang your drum elsewhere, because from where I stand, the new boss is pretty much the same as the old boss.
However, that io.js ships with v8 4.1 is quite a large step ahead for dependants, not just for language features, but also under-the-hood stability and performance.
Of course, there is also everything that node 0.11.x has, plus a release schedule to match Atom's own release cadence. :)