Moscow political scientist Professor Valery Solovei has recently thrown fuel into the speculation, by suggesting Putin is showing symptoms of Parkinson's disease.
"There is a family, it has a great influence on him. He intends to make public his handover plans in January," Solovei said.
Speculation has also been fuelled by the fact legislation introduced by Putin is currently being rushed through parliament, to guarantee immunity from prosecution and state perks for former presidents, for life.
The draft bill, currently in parliament, would give any former president immunity from criminal prosecution committed during his lifetime.
It is the second bill this week to address special provisions for former Russian presidents, further fuelling speculation of an imminent resignation.
Kremlin officials have played down the claims.