700 series devices are generally not compatible with existing ZWave software as they use a slightly different interface definition. This is because ZWA wanted to push people to use the Z/IP layer.
I do expect to get one of these any day now, and do expect this requirement to be phased out over the coming 12 months or so.
No - not at the moment.
I don’t expect many will now, and in future I expect it to be less - things will change over the next 12 months.