I must say I'm more interested in the ARM board being made to run a 68k emulator and appear as a real 68k cpu to the Amiga than anything else at the moment.
As i understand it the SAGA core is fully backward compatible with the original AGA chipset though.
you might change your mind if this ever happens :
"But we actually want to reach more.
We know that we can put APOLLO in to an ASIC.
And we know that then we can compete and beat even G3/G4/.. latest PowerPC or ARM Asics in performance."
(citation : )
http://www.apollo-core.com/knowledge.php?b=1¬e=5768