A)
No. Within your Native Application, you can use Native and POWERCORE plug-ins at the same time, and even in the same audio stream. So, you can keep using your favorite Native plug-ins while adding high quality POWERCORE plug-ins as your studio evolves.
B)
Upgrades and Crossgrades of existing plug-ins depend on the policies set by our third party developers. All TC Works TDM Plug-in users, for example, will get a free cross-grade to the VST POWERCORE format for the plug-ins they already own.