Disklavier

I'm interested in getting a disklavier grand piano.  The size of the
grand is not as important to me as the disklavier features.  It's
difficult to tell the difference between models from the Yamaha
website.  Do all of the disklavier models have pretty much the
same features other than the differences in the actual piano (and
of course disregarding the playback only models), or do different
models actually offer different levels of disklavier technology?

Also, I just saw the post about the new Mark IV system.  Will this
system be offered on smaller grands or just on the Pro series?
I want all the latest features but I'd rather save as much money
as possible on the actual piano.  A baby grand would be fine for
me, as long as it had all the latest features.

Thanks for your help.

Carl Youngblood