Still by looking at FC2 map editor, it's maps are really small and you can't fill the given space properly, (This is even harder with the consoles than it's on PC's, as consoles have veeeery tight object limits.) and the fact FC2 isn't very RAM consuming with the PC medium settings (Which are pretty near to the consoles, but the consoles use 8 bit HDR...). Crysis editor uses 30-40% of my RAM (8GB DDR3) when i have a huge map (As example some of the SP campaign maps.) opened in it, and i have modified the terrain, and am using very high settings. Though from what we've seen from a video that showcases CE3 editor, we saw the RAM usage indicator staid pretty near to 280. So i think consoles would be able to handle small maps, probably the map size could be near 256x256 metres for the consoles.