I see two possibilities for a 'new' AGA chipset, either a drop-in replacement motherboard for classics or a new mini-itx motherboard. If you're going to go to all the trouble of reimplementing the chipset in FPGA's then you might as well perform some minor improvements (eg faster CPU, memory speed), although further more drastic updates are all very nice on paper (eg 64 bit blitter, chunky display modes) you then run into software incompatibilities (eg the more enhancements, the less compatibility you have).
Obviously this kind of thing is only going to sell to existing classic users who are fed up with their caps exploding and ex-classic users.
As a classic user myself, I wouldn't be prepared to pay much more than about $200 for an enhanced motherboard which wouldn't really offer me much over my existing AGA 030 machine. At that kind of money, it would be very difficult for anyone to get back their investment into making such a board. I guess this is why Jens hasn't bothered to bring CloneA to market even though it appears to have been completed.
And where does all that leave Natami?