at B1G Media Days, Commissioner Tony Pettiti was asked about future expansion. He said (paraphrasing) that he is not hearing any push for further expansion from the current B1G teams - at least at the President/Chancellor level. Pettiti said they are focused on integrating USC and UCLA into the conference next year.
as far as Oregon, I'm seeing tweets that Oregon is one of 2 Pac-12 teams who are allegedly opposed to any Pac-12 expansion. We've all heard the rumors that Oregon and Washington are interested in the B1G, but as far as I know, neither team has taken any official action. any interest expressed is apparently behind the scenes (or possibly took place during previous Commissioner's term).