As the Christmas season approaches, the number of new demos appears to go up. GA-Source as word of the Urban Chaos demo scheduled to appear on Gamecenter on Friday, clocking in at a reasonable 25 MB. There are some new screenshots on GA-Source as well. Meanwhile, Shiny announced in their developers forum (thanks VE) that their Messiah demo should appear on GameSpot, also on Friday, weighing in at a far more heavy 75 MB.