Microsoft announced the versions and Pricing of the new Visual Studio 2015. Unlike the previous Visual Studio 2013, 2015 will have only 3 version available, Microsoft combined the Premium and Ultimate versions to Enterprise edition. They versions available are
Visual Studio Community 2015
Visual Studio Professional 2015 with MSDN
Visual Studio Enterprise 2015 with MSDN
The below image will give you a basic idea comparing 2013 versions.
The features included in each products are listed below
For detailed comparison you can check this page
Visual Studio 2015 Community edition will be free to use. while the Professional edition will be priced $1,199 and enterprise edition will cost $5,999 for new customers. Enterprise edition renewal price will be $2,569 and for Professional edition it is $799.
If you want to buy or renew MSDN subscription Microsoft has few offers
Buy or renew Visual Studio Premium with MSDN now and be automatically upgraded to Visual Studio Enterprise with MSDN when they release Visual Studio 2015. For the price of Visual Studio Premium with MSDN, you will get Visual Studio Enterprise with MSDN
Upgrade from Visual Studio Professional with MSDN or Visual Studio Test Professional with MSDN to Visual Studio Premium with MSDN for 50% off the regular list price and get a free upgrade to Visual Studio Enterprise with MSDN automatically when we release Visual Studio 2015.
Read more about the version and prices here
So will you, developers upgrading ? and which version you will be using ?. As the new Windows 10 and Windows 10 for phones supports universal application, it will be easier to develop appliations for PCs and Phones using the new Visual Studio 2015.