State of the art: Tkinter, Tk 8.5, Tix?

[excord80]

On Jan 10, 11:45 am, r <rt8... at gmail.com> wrote:
> We need TK 8.5's themes. This will bring Tkinter out of the dark ages
> and into the 21st Century! And improve the shine of the Python base
> distro. Python could use a good boost right now!

Could someone please explain what Tix provides compared to what the
new stuff in Tk 8.5 provides? Is there much overlap?