I’ve heard this from multiple sources now, and it was confirmed again at yesterday’s Microsoft event, where the company announced the ARM-based Surface Pro X. What’s unclear is why Google isn’t releasing Chrome for ARM64. There seems to be some kind of disagreement between Google and one of the other companies involved (either Qualcomm or Microsoft), and last I heard, it will likely be resolved some time in the February timeframe.
At this point this doesn’t seem to matter much – how many ARM Windows 10 devices are out there, really – but with Microsoft really going all-in on ARM now, it’ll really want this issue resolved quickly.
On the other hand Firefox is already available for Windows on ARM.
Disclaimer: I work for Mozilla and I specifically worked on the ARM port, so shameless self-advertising.