It would seem that the Visual Studio 2015 licensing SKUs are being announced now so as to provide organizations with a little time to ready themselves in terms of planning for software renewals and such with the new IDE coming out later this year.
According to the Visual Studio Blog posted on 31 March 2015, there will be a single offering called Visual Studio Enterprise with MSDN that combines the Ultimate and Premium SKUs. This reduces the number of SKUs from 4 to 3 (Community, Professional and Enterprise).
For those that have a Premium SKU, it’ll get upgraded to Enterprise SKU. Apparently the cost of the Enterprise SKU will be less than that of the Ultimate SKU, but I’m guessing a tad more than the Premium SKU.
For more information check out the Visual Studio 2015 Product Offerings page.
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New MSDN SKUs announced for Visual Studio 2015
The Tech Blog of Dan Usher 