It seems there is some confusion. According to a couple other articles. Nokia gets to keep the Nokia brand name, but Microsoft gets to use Lumia and Asha (Microsoft Lumia XXX). Additionally, the Nokia brand name can be used for current and soon to be released devices (i.e. Nokia Lumia 930) for up to one year (Forbes). So while Nokia's OFFICIAL Twitter feed says that Microsoft can use the Nokia brand name for Lumia, Asha, and X family of devices, it didn't say for how long. The following article is much more specific. Softpedia essentially either misunderstood the wording or took the 10 year part out of context.
Nokia Licenses Brand Name to Microsoft for Features Phones - Bonnie Cha - Mobile - AllThingsD
"Microsoft gets limited rights to use the Nokia name, primarily in the low-end mobile phones that are based on the older S30 and S40 operating systems. There it can use Nokia?s brand for 10 years. But when it comes to smartphones, Microsoft only has the right to use the Nokia name on Windows Phones that are in the market when the deal closes."
Oh, and Nokia can't use the Nokia brand name on phones until Dec 31, '15. At that time it can start making phones again. Which I doubt they intend to do.