Sorry for the delayed reply everyone. Haven't checked the forums in a bit.
1.Mike will be making art packs using the usual technique used in professional studios which isto render it in 3d, then use that as the base for the hand-drawn art. You'll be able to replace the body parts with your own art, and tweak the animation. You'll most likely get ideas of how to solve some of the problems associated with making iso characters as well.
The deformation is the very last thing we're adding to Spriter. It might appear in some limited fashion before then, but it won't be until after 1.0, which is estimated for a late December release.
Procedural animation will arrive before deformation, and possibly before 1.0. Using procedural editing features will provide some new an interesting ways to deal the isometric issue, and things like forshortening, etc. With video of the features in action it'd take a minute or two to describe and make sense. Without video, I'd have to outline it in detail, which is quite a read, but if you're interested, can be found here. Please excuse the typos. It was the last 64 hours of the Kickstarter.
2. It will be when I or someone else makes a plugin
unfortunately I won't be able to get to that in the near future. If any of the other CC plugin devs want to get to it sooner, I'd be more than happy to help them.
To everyone else, sorry it took so long to update you on the Construct 2 plugin. I need to confirm something before making the announcement, but I expect to have some good news by the end of the week.