Mach4 will be a standalone program, as will the wizards for mill. Mill wizards are running now even before Mach4 is ready to be released.
There may be more wizards in the future that run as part of Mach4, much like the current Newfangled wizards. Brian showed me a demo of the screen designer and scripting language this week. Its going to be a much more capable system than we had in V3, so I expect a lot of great wizards, but its going to be a while yet- I dont think Mach4 with the full screen designer capability will be out for at least a few more months.
Great things are happening, its hard to wait for them.