PS: this is almost a given, it was done with almost every version of windows i recall.
and generally if you buy a developer tool within 90 days of a new version they have in the past made the upgrade free of a shipping cost of 10 or 20 bucks.
for example is VS 2010 is RTM'ed in Feb 2010 then buying VS 08 in dec or jan should get an upgrade for shipping cost. if they do what they have done before.