There are allready some very good inhouse sounds.. (As you mentioned)
I tested the Linux sampler under Linux, and it sounds just as good as any of the other top vst sample players like kontakt or halion. This giga sampler (thats a free download under Linux) was developed espescially for the mediastation and is the base of the mediastation sound.
There are allready some free vst's bubdled with mediastation.
I'd hate it if they would "Force " people to buy one very expensive vst with the mediastation, as that takes away from the people's freedom of choice. People are free of will nad can decide for themselves what they want.
Next to that the VSt will not be used as the base of the sound, but as added solo sounds.
Somehow people seem to forget what Linux is/was all about ... You buy a piece of hardware and the software comes with it for "Free" so adding payd expensive vst's would not support that.
Dom still has got a lot of credit with me, i am in the software development buiseness myself and i know how much effort it takes, not to create things... but to get them working flawlessly.
But i would not advise anyone to buy the Mediastation right now, as we haven't heard it live yet and because the style section is still performing under par untill they have a few hundred top-styles for the new Q-ranger. Sadly Dom and Lionstracs need the money from their sale to pay for the further develoment and their own livings.
Dom would best concentrate on the musicall part of the instrument and find some really great musicians that can create some really great styles... Somehow i think Dom himself is more of a wizzkid technician then a musician. And a wise man knows what he can do himself and what others can do much better.