This is breaking news:
With the Vampire accelerator boards out and in mass production, and AROS gaining momentum on m68k, it has been announced that the Apollo/Vampire team will open-source their S-AGA enhanced Amiga-compatible chipset!

This means that other companies can build Vampire/S-AGA compatible hardware.

AROS is already open-source, and running on the Vampire boards. It still needs optimization for the S-AGA chipset.

Yes, it looks like it's finally happening. A new 68k-Amiga.

AROS-m68k running on Amiga Vampire 500

Sources:
http://www.apollo-core.com/knowledge.php?b=1&note=5768
http://www.apollo-core.com/knowledge.php?b=1&note=5580