AmigaOS 4.2 will incorporate AmigaDE so there's no need to mess with OpenAmiga.
Yes, but the DE isn't suited for everything, and doesn't run on Classic Amiga or MOS. The whole idea with OpenAmiga is that software can be run on any of these platforms. I've never got AROS going properly, and I don't particularly like MOS, but I can still see the avantages of OpenAmiga.
Besides, OS4 isn't out yet, so it's a bit early to be talking about OS4.2 or even 5 :-D
