Win 8.1 NVIDIA GeForce GTX 780 Ti
Animation Nodes ~ Loft Splines
I am able to change the vertex of the loft's source splines and see the generated mesh morph as expected.
I'm also able to use Hooks to move a point of that surface control curve like this demonstration.
Unfortunately the curve moves independently and even offsets after hooking when moving the vertex in edit mode. It actually jumps to a different location in edit mode after being moved by the hook control mesh.
My guess is the animation node should appear in the modifiers and then I can put the order of the hook before it.
Maybe there is really a bug there, or it's super unclear what to do so maybe a toggle is needed somewhere (either in Splines from Object or the Hook modifier) to enable this to be even more procedural by allowing vertex hooks changes/animation to be observed by the animation nodes Loft Spline node.