First, welcome to the forums.
If you don't mind a bit of a humorous reply, there is a major difference between a classic car and a rusted out beater. VSL is the former, not the latter. <smile>
More seriously, VSL, as a company, is a bit different from some of the other ones out there. What they release is very well done, as you yourself said, and therefore tends to only be replaced very rarely, as the Vienna Piano replaced the previous Bosendorfer (still available). If by chance you've also listened to the demos of that older piano, it is clear that the Vienna Piano is in a very different league. The VSL woodwind libraries are another example of a highly regarded "older" product. Even the "lowly" SE woodwinds are still recommended as some of the best woodwinds out there in other forums (the v.i. control forum).
When new products are released, in the past VSL has offered generous upgrade paths to existing users. Even with the SE sample libraries, ugrade discounts are given when the SE library owner purchases a full library of related content.
In recent years, VSL has been developing first Dimension Brass, and currently Dimension Strings. Some Recorders were released as well. In terms of software, focus has been on MIR Pro, and related products. My best guess is that a new piano is not forthcoming in the near future (as I don't work for VSL, that is strictly a guess). Again, unlike many other companies, VSL tends not to announce things well in advance. They tend to announce products only when they are nearly finished, or indeed, after they have been finished.
Again, welcome to the forums.