Well, as someone who IS playing with the new beta, let me tell you I love it. It fixed an error that I was having in 1.5 with the Multi-Slot system.
...Of course, it also has a few issues too. The first is something that happened both in your demo and in my test map whenever... well, anyone tried to attack anything. I'll let you see.
Then there's this when I try to go to the Iso + Battle Test, then go to the Battle Test and do a battle there(This is what happens when I try to move).
It looks kinda cool, but 'looks cool' and 'actually is viable' are two different things. Possibly worth noting is this:
The semi-transparent(If screwed up) movement range disappears once I move the cursor outside that range and doesn't reappear when I move back into range.
Well, those are my bug reports so far.
Oh, and on the smaller scale, using the Enhanced Equipment system by Charlie Lee, enhanced weapons and armor can't alter movement ranges.
EDIT: Actually, enhanced armor can alter movement. Enhanced weapons can't though. Weird.
EDIT2: My mistake. Enhanced armors don't work either. It's also worth noting I'm using both Enhanced Equipment AND Multi-Slot, but I don't think that's affecting anything.