Does Rubio's recent activity say anything about JEB! 2016?

Most pundits generally consider Marco Rubio won't run in 2016 if JEB! does.  Rubio's recent activity, however, suggests he is revving up a position for a run.  He is trashing talking Hillary on national TV, and he has proposed folding Social Security into the Federal Employees Retirement program. Has he been talking to JEB! or sources close to him, or is he just getting ready if the opportunity arises?