Correct. Most architectures out there are RISC at this point. RISC has more than proven itself. It has basically become a defacto standard, outside of the x86 world.
Actually, "true" CISC pretty much died with intel's "Netburst" architecture just before Apple switched to Intel: The current x86 "Core" chips are all descended from the Pentium Pro architecture which (to simplify somewhat) was a RISC-like core sitting behind an x86-to-RISC translator. So while it might be stretching a point to say that even current Intel chips are "RISC" they survived by adopting a lot of RISC principles. Obviously, ARM can fit a few more cores in a package without all that translation gubbins...
I suspect a lot of the power of these A-series chips comes from the GPU and other co-processors that can be crammed onto the chip thanks to the simpler CPU core.
I just hope that Apple's plan isn't to kill off the Mac and force everybody onto closed-down iDevices. Tablets are great for the thing that tablets are great at, but they're useless for some stuff that laptops/desktops are good at. Crowing that your tablet out-performs your more expensive laptops isn't a good plan if you plan to keep selling laptops.