JurassicC has posted some additional details on AmigaOS 4.1 Classic.
I read all that post, but even now, over a month after release, Classic OS4.1 was released about 17-5-2011 as far as I am aware, and since then I haven't seen any Classic OS4.1 user say that their A1200 is working with a SOLO-1 soundcard, or SATA card, and some people are still having problems with Radeon cards even though they work under OS3.9 in their Mediator setups.
So far Classic OS4.1 does not seem to be doing much better than Classic OS4.0, unless someone can prove differently. I'd really be interested for someone else to be able to wave the flag of success, but I haven't really seen anything obviously better, as there is very little additional hardware that's supposed to be compatable, but that hardware, in any case, doesn't seem to work in a usable way.
I think some A4000 users are having better times, but the humble A1200 user is not getting much compatability with their PPC hardware. Anyone know differently?