I see. The first part is probably doable with MoGraph, since it’s actually kind of a fake. The letters are just lining up with the cube and not really transforming into it. I’d try to do that with the mograph text object.
The second part would have to be animated by hand, I’m afraid. I would convert the text to geometry and use the knife tool cut it into chunks. Then use Function>Split to separate the chunks into separate objects.