I know the Spriter guys have gone through some rough times, I'm very sad upon their misfortune. Truth is, Spine is a superior tool. I've tried to communicate this several times, but Spriter lack every important tool an animator need: Control of timeline measurement, multiple timelines, post-construction modifications (good luck adding any sprite to an already done animation) and the feature lacking most of all: Curves.
There will probably be very little support for Construct from Spine.
To clarify, Spriter has had seperate timelines per object for the last couple of builds, and the new build which will most likely be released tomorrow finally has many of the post-construction features which we'd agree with you were long-overdue (like everything else, due to the delay) Speed curves are not in this build, but will definately be part of 1.0's feature set and in fact might appear in the following build.
Mike at BrashMonkey
Her's a video showcasing the features for the current build:
The part about the multiple timelines is almost exactly at the 10 minute mark.