Earlier quoted context omitted.
"OK Google", Google Now, their voice recognition tech, and NLP recognition are far far past Echo's version. So if the hardware is that easy this should have been out yesterday. The even mentioned earlier in the keynote how they've been training it Google assistant with background noise.
Speech recognition is a lot harder than you'd think, and the problems of far field speech recognition especially. All of google's in-house ASR (and wakeword) has been dedicated to near-field devices. Speech is not a "solve it once and it works everywhere" kind of problem. I would ballpark that Google needed to collect 10k hours of _far-field_ speech to train this to a level that was acceptable for the enormous variet…
To still be aiming for end of year seems like some serious missteps and catch-up going on.