or not since the article you quoted was written before RC1 even was announced for download. Those are the BETA requirements.
Or any search of a site that has updated information.
But as quoted on Toms Hardware "he only real changes to the system requirements since January are slightly bumped up ones for the 64-bit version, though we suspect anyone who plans to run the x64 build will have a machine that’s way beyond the minimum (having at least 4 GB of RAM would be a good starting point)."
That most x64 systems will have at least 4 GB of Ram.
As far as it running on less, because of MS's new service administrator, services are automatically shutoff when not needed to insure maximum performance. So yeah you can run a system with less, but with current prices of ram, why would you?