From the blog post:
In the fun surprise category, we’re enabling developer registration in 13 new markets via Dev Center with this release: Afghanistan, Albania, Andorra, Azerbaijan, Bosnia and Herzegovina, Georgia, Iraq, Kyrgyzstan, Libya, Mongolia, Montenegro, Serbia, and Timor-Leste. Developers in these 13 markets will now be able to register a Dev Center account and submit free apps to the Windows Phone Store. Check here for a full list of the 191 Windows Phone Dev Center supported markets.
The growth and availability of the Dev Center is another area that Microsoft have been very active with that doesn't get as much attention as it should. It's these elements and building blocks that will make Windows Phone a success.
You can read Todd Brix's full blog post over on Microsoft's Windows Phone Blog.