Umm ... seeing as Gravity II already has a description, and its the same as Gravity I's I'm pretty sure we can bet that it'll have the same effects (movement speed down, minor evasion down, short duration). Which means it'll run into the same game mechanics that had SE nerfed the sh!t out of Gravity 1. Basically RDM's using it to solo things (the only thing it was good for). SE doesn't like RDM soloing things, so their gonna nerf if the same way they did Gravity 1, for the same reasons.

So yeah ... unless SE goes back in and alters the description and removes the -movement speed effect, it's going to be useless. It mind as well be Diaga II.