Living in Bicester - anything to do with this extension is reported widely. Bicester town station has been cleaned up since Chiltern took over the running from Oxford to Bicester Town, mainly to service the tourists going into Bicester Village shopping outlet, they have also increased the number of trains. They plan to open another station at Water Eaton (Between Oxford and Islip).
Attached link to Wikipedia which explains all.
CANT COME SOON ENOUGH FOR ME !!!!!!
Dave
http://en.wikipedia.org/wiki/East_West_Rail_Link