According to various news outlets on French TV he may well be.
He obtained an endorsement yesterday from Chirac's wife, and there appear to be growing calls for him to run in 2017.
What's frightening people is the possibility of a run-off in 2017 between Hollande and Marine le Pen. The left worry that they could lose that race, while the right fear that they could win it. This would consign the UMP to the sidelines as a right-wing force.
Bernadette Chirac souhaite le retour de Sarkozy - Europe1.fr - Politique