Well firstly, the Ultima Iris 2d engine will have all the scripting abilities of the 3d version, so you can have all the custom gumps and other GUI features you want. It also supports roof fading, zooming in (much better looking than the OSI zoom feature) and will hopefully have the soon to be added particle system. As well as all this you can play at any resolution you want. For example, the shots here were taken at 1600x1200, that gives you 4 times the maximum view area of the OSI client! :)