I think this is great, I always wanted a PPC in my Amiga, and I already have a copy of OS4 sitting around. It certainly feels nice to have a system where you just install it and it's very nice and a bit more modern feeling than dealing with OS3.9, BB1-4, then the plethora of other third party utilities you have to slap onto it to make it.. oddly more like OS4 is.
But (of course there is a but) at the same time tweaking the OS to our hearts content is part of the Amiga charm, so why would we want a shiny out of the box experience? I figure if I got a PPC, I'd still get a dual set up, OS4 / OS3.9 + Amikit for Real.