Yes , you are right http://murga-linux.com/puppy/viewtopic.php?t=75588, but that has only 3 gtk3 applications included,ally wrote:just waiting for the iso to become available
out of interest there is another puppy with gtk3 from jan 2012
214X-GTK3-alpha10.1.iso
here everything except firefox uses Gtk3 - so I will leave title as is.
iso is now available!
Edit and off-topic: I's sorry, but this forum starts to look kinda boring