It's learned that Robbie Amell will be back.
Specific details how Robbie Amell will return are being kept under wraps, but since both time travel and alternate worlds are involved with The Flash, anything could happen. It's also unknown if Robbie Amell will be back as Firestorm.
It is said Robbie Amell will be back during a Winter episode of The Flash.
Robbie Amell's Ronnie Raymond Firestorm perished while stopping the singularity portal to Earth-2. Amell also returned as the Earth-2 villain, Deathstorm.
The Flash Season 3 returns Tuesday, January 24th at 8pm ET starring Grant Gustin as Barry Allen/The Flash, Candice Patton as Iris West, Panabaker as Caitlin Snow, Carlos Valdes as Cisco Ramon, Keiynan Lonsdale as Wally West, Tom Cavanagh as Dr. Harrison Wells and Jesse L. Martin plays Joe West.