Has Microsoft published any info on license upgrades from Visual Studio 2013 (no MSDN) to 2015?

Question

Microsoft has published pricing on new purchases or upgrades from VS2013 with MSDN, but I haven't yet found any info covering upgrades from VS2013 which were purchased without MSDN e.g. VS 2013 Professional.

In my specific case, I want to upgrade from Visual Studio 2013 Professional to 2015 Professional. My only option appears to be purchasing 2015 with MSDN, with no consideration from my existing 2013 license. Am I overlooking something?

Answer 1

Update 2

I chatted with a Microsoft specialist. There is no upgrade pricing at this time and no upgrade pricing in the future, "that they are aware of".

Update 1

Visual Studio 2015 Professional stand alone is now available for $499. No word on upgrade pricing yet.

Original

It is now September 1st and the stand alone Visual Studio 2015 Professional is still not available.

I chatted with a Microsoft specialist. She confirmed that the stand alone Visual Studio 2015 Professional is not available and she did not have a release date.

The Buy Visual Studio and MSDN subscriptions page now lists the following:

Please note: purchases through the Microsoft Store In some markets will show prior version products (Visual Studio Ultimate with MSDN, Visual Studio Professional 2013), but are being updated through the end of October 2015. Please purchase Visual Studio Ultimate with MSDN or Visual Studio Premium with MSDN to get Visual Studio Enterprise with MSDN. Please wait to purchase Visual Studio Professional 2015 until it is available; purchasing Visual Studio 2013 will not entitle you to an upgrade to Visual Studio Professional 2015.