Those expecting these killer libraries wont get it - sorry. Too much to change to fit in Reasons "box". CPU usage being one of them. Those VST's are programs themselves so I dont see them shrinking and limiting functionality and risk hurting a products name.
However I expect those companies to develop new products "extensions" for Reason. Primarily effects and mixing tools. Not huge amounts of sounds. They couldve done that via combinator refills. Most reason users create in Reason, then put things in another DAW to mix. Why? Because not many people are fully happy with using Reasons effects or mClass suites.
Now that they are doing audio, they needed tools from companies (large & indie developers) who do it right & better than Props could have while retaining their stable environment.
It wont be an earth shaking event, except to the exclusive reason user & those he collaborates with.