Our current version of V8 that Android (and native modules) are built against is V8 22.214.171.124. That version is from mid-May 2012. It is very, very out of date. We should move to a more recent Long Term Support version of V8 engine to gain ES6 functionality as well as significant performance increases.
It's worth noting that the is a major change and will break backwards compatibility of native modules, and may force us to drop support for older Android releases. See https://en.wikipedia.org/wiki/Google_Chrome_release_history where it looks like Chrome app dropped support for Android 4.0 with the 43.0.257 release (which uses V8 4.3.61).
Here's the changelog up to 3.31.1: https://code.google.com/p/v8/source/browse/trunk/ChangeLog
Here's the changelog for 4.8.151: https://github.com/v8/v8/blob/4.8.151/ChangeLog