Upgrade path for Logic Studio Pro?

Hello. I have the boxed version of Logic Studio Pro, that came Logic Pro 9, Mainstage 2 and Soundtrack Pro 3. Is there an upgrade path to get the latest version of Logic and Mainstage? I realize these are now discontinued, but is Apple providing some sort of discount or upgrade path for people that want to get the latest Logic & Mainstage?

thanks;

John