He notes that Template Strings allow for multiline strings, which is in itself a significant advance, and that you can also have Tagged Template Strings which can transform the Template String automagically in many interesting ways. His example turns a Template String with embedded variables into a preparable query with a list of parameters. It's very nifty, quite clever in fact.
My understanding is that to get these features we need to provide for PLV8 to build against the latest version of V8 (and possibly provide some initialization flags too.) Unfortunately, the V8 API seems to have changed significantly since the 188.8.131.52 that's available on my Fedora 20 workstation, so enabling it to build with, say, V8 version 184.108.40.206, which is what io.js is using, will take quite a bit of work, probably by someone whose C++-fu is greater than mine.