It appears that the fifth installment of the Skylanders franchise shall be titled- Skylanders Superchargers.
Travis Pastrana, a professional motocross riders has said that he has been filming some cool stuff for a new Activision game titled, Skylanders Superchargers. It could include vehicles which would be a good way to go, it would most likely be like Swap-Force, different vehicles having different traits like Power, Speed or Stealth.
Skylanders was first released back in 2011 with Skylanders Spyro's adventure. Then another installment in 2012, Skylanders Giants. The another in 2013, Skylanders Swap Force and in 2014 with Skylanders Trap Team.