I've been blogging regarding progress on the
REBOL 3 host kit implementation (which includes the
REBOL GUI) at
my web site.
The GUI is a bit rough but it is functioning as can be seen
from the screen shots.
Carl Sassenrath is doing bug fixes for the REBOL core as we go and compiles the AmigaOS version on his Sam440ep system.
I hope to have something releasable in the near future but my time is very limited at the moment.
REBOL 3 itself is marching towards a beta release (it is currently at the alpha stage).