Sprites from JSON : Why does every version change this?

It seems like every time I update Unreal, something changes about how sprites are imported for Paper2D.

In 4.7, I just have to import my json file that Flash outputs, and Unreal automatically breaks up the image and all its frames correctly. The tutorial mentions that it automatically makes a FlipBook which must have been the case but that has since changed.

Now, in 4.8, when I attempt to import the JSON, I’m given a choice of DataTable, CurveTable, FloatCurve, or VectoreCurve. None of those apply, and none of them work for a sprite.
How do I import a sprite from JSON?

Also, where can I get a list of breaking changes like these when a new version of UDK comes out?**