I've heard nothing. Given that the bus access is via a short section of guideway, that makes it likely that either or both of the Busway A (Stagecoach) and C (Whippet) will make a long loop to the new station, which'll annoy anyone coming from town and trying to get to St Ives.
However, I think it's highly likely that Stagecoach will terminate some buses from St Ives at the new station in the morning and evening peaks, since that allows them to avoid buses getting snarled up in Cambridge city centre.
However, I think it's highly likely that Stagecoach will terminate some buses from St Ives at the new station in the morning and evening peaks, since that allows them to avoid buses getting snarled up in Cambridge city centre.