Hi,
Thanks for your reply!
In fact, I'm more worried about the old already indexed links in Google. I guess they could harm more than helping my site.
I understand that I'm able to set a redirect but do I have to redirect each single page? There are a lot of site indexed already. Also the same content will appear on the new release but on a different link structure. So I'm a bit worried about getting a penalty by google for duplicate content.
I hope you see what I mean.