After listening to a brief discussion on a Lumix video, it appears the new on/off switch limits the zoom range to the range where the teleconverters will work. If it is not enabled, then there might be a disconcerting clunking sound when zooming too far out with the teleconverter; won't damage the lens though.
So I don't believe there are any new focus limiting capabilities. I don't think there are any new macro capabilities either; the .5x figure being thrown out is just some sort of an equivalence number for 35mm. But if the minimum focusing distance remains the same with the 2x teleconverter, then you should be able to double the image size when using the teleconverter vs. what the original lens offered.
So I think what this all boils down to is the only real functional change is the ability to use teleconverters. The video says the weight remains the same. Though perhaps there are optical/image quality improvements – will have to wait for reviews to see if that is the case.
So I don't believe there are any new focus limiting capabilities. I don't think there are any new macro capabilities either; the .5x figure being thrown out is just some sort of an equivalence number for 35mm. But if the minimum focusing distance remains the same with the 2x teleconverter, then you should be able to double the image size when using the teleconverter vs. what the original lens offered.
So I think what this all boils down to is the only real functional change is the ability to use teleconverters. The video says the weight remains the same. Though perhaps there are optical/image quality improvements – will have to wait for reviews to see if that is the case.