I'm afraid that won't happen for most of the SE plugins that you use right now. The 64-bit version requires 64-bit SEMS (modules). Current 32-bit SEMS are not compatible, and will not be supported via a 32-bit bridge. This means at first most existing project files will not work in the 64-bit version because the SEMs are not available.
A lot of developers use 3rd party modules from different sources for their plugins. Those modules would all have to be rebuild (a lot of work) for 64-bit by their developers.
Chris Kerry for instance, has made an enormous amount of SE modules. It would take him almost a life-time to convert all of them to 64-bit (which he won;t do, he already said).
And there are a lot more SE module developers..
As I said somewhere before - I'll add quite a lot of modules(for free) - when SE1.2 64bit goes public, but only 'audio processing' modules though. I've already replicated (for personal use) - a lot of modules from DH ,CK, and SC. Most of it is exceptionally easy(+/- 30min worth of work per module). To port modules is only "alot of work" if the module is SDK2 and/or uses assembly code(assembly is what a lot of CK modules uses as well as some Native SE modules actually.)
Alot of Chis Kerry's modules - will be severely missed though - i.e. Oscillators, clocks and Midi stuff. Hopefully someone else will step up to the plate to help out with those kind of modules. I'll cover filters, probably some envelopes, distortion and clipping , any math conversion(volt2dB, time to kHz etc) and probably a bunch of other small yet usefull/new things.
Xavier (kx77free) is currently working hard to build some 64bit templates - over at the SDK group, for different compilers - and Jeff is workig on the 64bit 'Save-as-VST' feature. Progress is progress, some projects might die - but new/better projects will rise from their ashes.
Andrew a.k.a. TD.