I tried to put in a link but got it wrong. As of 5 minutes ago on Sky news in the UK Nokia shares were down 18%.
Edit; now at just under 13% down.
No doubt a strong marketing campaign is going to be necessary to get Nokia back in the black, but I think the hardware they just released is capable of getting them in the right direction. Nobody knows Windows Phone in the US because the biggest carriers haven't supported it. Rumor has it, that will change with WP8. Get people interested and excited about it, and that stock price will go back up.