EXS 24 Logic Sampler Users Group

Emagic is dropping VST support in its OSX development (drama city here we
come):

Because of these and other advantages in comparison to current 3rd party
native DSP plug-in formats, Emagic has decided to focus on Audio Units
exclusively. The decision to only support Audio Units was not taken lightly;
we listened to both developers and users before making this decision and are
convinced that Audio Units represents the optimal path forward for plug-in
development. We understand, of course, that some users may initially be
concerned that they will no longer be able to use their favorite 3rd party
plug-ins in Logic under OS X. However, upon closer examination, the facts
are that all plug-ins available under Mac OS 9 must be adapted
("carbonized") to function under OS X at all, and that this task has been
carried out for only a relatively small fraction (we optimistically estimate
between 5 - 10%) of the available 3rd party plug-ins. This means that the
Macintosh audio community now has a unique opportunity to standardize on a
cutting-edge system-level format built into the OS, rather than dilute its
development efforts by continuing to support a disparate and often poorly
documented range of "standards".