Progressive DVD?

I just installed my new Pioneer HD-520 TV. I currently have an old Pioneer DVD player connected to it(using component cables) even though it's not progressive scan. The picture quality is really very good.

I'm going to buy a new progressive scan player(hopefully the new Pioneer DV-47A) does anyone know when the DV-47A will begin shipping?

My question is how much better is progressive scan over non-progressive. I feel that my old player does a pretty good job. Will I be blown away by new progressive technology since it should be getting better and better or are the differences minor?

Thanks,

Rob