MenuetOS 64-bit 0.99.57 was released on 22 April. There hasn't been much news or information on this new release until a Phoronix reader wrote in this morning about the MenuetOS update. The home-page just mentions "updates and improvements" for the new version.
On the MenuetOS download page, the 0.99.57 release notes just list, "Updates and improvements (httpc, ehci, picview, memcheck, menu, wallpaper, ohci, uhci, maps/streetview, icons, dhcp, freeform window, smp threads, smp init)."
Those wishing to learn more about this Assembly-based OS can visit MenuetOS.net or to download the operating system that's free for personal and educational use.
Here's an older version of MenuetOS in action, running off a floppy disk.