[morkbot]

From the linked article (OK, press release):

It will, however, run (...) on the platforms that support SIMD. This includes both the client platforms (...) as well as servers that run JavaScript, for example through the Node.js V8 engine.

...and:

A major part of the SIMD.JS API implementation has already landed in Firefox Nightly and our full implementation of the SIMD API for Intel Architecture has been submitted to Chromium for review.

...and:

Google, Intel, and Mozilla are working on a TC39 ECMAScript proposal to include this JavaScript SIMD API in the future ES7 version of the JavaScript standard.

So, yes, there's definitely an intention there to put it into V8/Node.js/ES7 (guess, it will be in this exact order).