German: Und ich bin gespannt, was Matthias so zu erzählt hat.
English: And I'm curious about what Matthias has to say.
What function does the word "so" play in this sentence? I assume that it would be possible to simply say, "Und ich bin gespannt, was Matthias zu erzählt hat." What nuance is added here by adding "so"? I'd be grateful for an explanation of the use of "so" in this context.