I just got my new 1018 yesterday, and it works fine hooked up to a 24" 1920x1080 monitor.
The GMA 3150 even works to power both the Dell display and the external monitor at the same time, which something like 2,688,000 pixels (1024x600 + 1920x1080).
The notebookcheck.net review of the GMA3150 has conflicting information, at one point it says it will support only 1400x1050, but elsewhere it says 1920x1080 on the external vga connector. It's capbale of 1920x1080, but apparently not officially supported.
The 3150 has to work a lot harder to push all those pixels, and things like smooth scrolling in firefox is a little slower, but it's not big deal. Also, hd youtube is less smooth. Too bad there's no ion2 option for the minis.