Hi Nannu0gg! We're always improving the site in smaller ways, but there aren't any plans to overhaul in the same way as Mumsnet at the moment. That's not to say it won't happen at some point though.
Re the OP in a different colour, both MN and GN are the same in that the OP is the same colour as all the other posts on the first page, and then on subsequent pages it is highlighted blue.
You can also click on the star in the top left corner of the OP (or your own posts) and any subsequent comments by that poster will be highlighted.
Not sure about the links changing colour, but it's something we can look into and see if we can change 