Damn you people are a bunch of girls.. Who cares if it doesn't look "pretty"? I don't think Gulbis himself changed it because of the way it looks. I think efficacy is the most important (and the only important..) factor here. He says he will train more and be more dedicated so perhaps his new forehand is something that will help him produce some results this year. He looked very good in Rotterdam.
Also, there is nothing wrong with a big backswing. It helps you set up for a bigger shot. It's just that I have no idea what the hell he's trying to do with his left arm. But I'm sure there's some thought behind it, he's not just making up random movements just for heck of it.