This update appeared on CrowdSupply. I don’t know if people ordering via Mouser also got the info.
https://www.crowdsupply.com/sifive/hifive-unmatched/updates/double-the-ram-and-new-delivery-date
This was also mentioned in the fourth paragraph of a press release last week.
https://www.sifive.com/press/sifive-wins-3rd-consecutive-title-of-most-respected
Your own product page does not reflect 16 vs 8 GB some 6 days after the announcement was made.
12 days.
I had actually pointed out the web site problem 12 days ago internally, but didn’t file a formal bug report. I did so this time and so it should be fixed sometime soon. There is also the problem that our HiFive Unmatched Product Brief still says 8 GB and that has been reported as bug also.
The web site is now fixed. The Product Brief still needs to be fixed though.