This passage was announced and it seems that will occur by the end of 2011. So far the Ovi logo disappeared from the site changed to a more subtle on blue background of Nokia. The title of the site was renamed Nokia Store.
I assume Nokia Store will provide applications for Symbian and Windows Phone 7 Marketplace for Nokia phones with WP7 Mango or Tango. By the way, Tango is a lite version of WP7 more made to run on phones with a weaker hardware.