IMO, the Pro version falls short, not even in the same ballpark of the Premium/LE. The bell is huge, the drop targets are huge, the mini playfield is huge, the ramp to feed the cannon is huge and hopefully the color changing LEDs are going to be very huge.

I would wait and try and pick up a HUO Premium.

Stern built a system new in this game to change the color of the bulbs on demand. They purposely left labels off the shots so that they can change the color and effectively change the shot and what it does. It could be used just to keep track of progress on a mode, some modes might require you to hit certain shots for more points, the AXE lanes could change colors and collect extra balls or multiball. It's all speculation right now.

Even the shots on the mini change color. The potential for creating amazing rules around this is limitless. The only thing is, nothing has been released yet.

What exists today on the LE/Premium is basically the Pro code with the mini playfield, bell and diverter very basically implemented. In reality, the LE/Premium today with all those extra features is basically the pro. However, once they finish up the Pro code and start implementing and expanding on the LE/Premium features, I'm hoping for a whole new game with an experience taken to the next level.

Without seeing where they are going, there is no way I'd buy the Pro. If you wait for the code and decide you don't like it, I can see that. But what if you go Pro, and then they update the code and you can change shots based on color, and be able to have a multiball where you play the mini and main playfield at the same time, and the rules are tweaked around the diverter, or when the bell starts swinging itself you have to shoot under it etc. It would suck to be stuck with a Pro if they go all out on the LE/Premium.

My 2 cents.

The rules aren't fully implemented. With the color changing inserts it's possible that the cannon will only load from the left ramp when the insert is a certain color etc. They could even write rules that can change the right ramp a certain color and when lit only the left ramp loads the cannon. There are a ton of cool things they can do with the crossover, I'm not sure if they'll do anything like that or not, but it's too early to tell.

It's possible that while either ramp could load the cannon, only one ramp at a time will ever be able to based on the color of the inserts as well.

Yup:

They test RGB, but the bulbs are capable of displaying multiple colors at the same time, so they aren't limited to just 3.

It's an LED bulb. As to how exactly they work, I have no idea.

However, you can rest your skepticism aside, they exist and I'm positive they will be utilized and hopefully have a major effect on the game.

Right now, there is no code at all that changes the color of any inserts. GI yes, inserts no.