It will most likely still be at least a week until the release, but it is an update to the current plugin (and Spriter itself). In the meantime I can give a little information for anyone who's interested. First, this update will enable a new mode for the plugin that operates in a completely different way, and hasn't had extensive testing yet - so upon release, the new mode will be considered alpha, bugs and quirks should be expected, and it should be used with caution. Also at this time, the new mode does not work with sub-entities, and potentially other features.
The new mode for the plugin draws itself instead of using separate sprites. For games that don't make use of individual sprites, this new mode eliminates quite a bit of overhead, resulting in greatly reduced cpu and ram usage. In addition, as far as I can tell, Construct 2's spritesheets don't utilize trimming (removing transparent border pixels of each image) or rotation(rotating images to make them fit in a smaller space). Because of this, Spriter's generated spritesheets, which are used by the new plugin mode, may also use significantly less vram depending on the images used in the project. Finally, since this is a new mode and not a separate plugin, it will be possible to convert your C2 projects using the current plugin, without having to replace objects or events (though it will require a fairly painless manual import process).
Here's an example of the types of speed differences I'm seeing on my machine: (bottom image is using the new mode)