While we did see the Earth-2 version of Wells don the Reverse Flash costume in order to help trick Grodd, it's learned that isn't the last we have seen of the Yellow Speedster.
The CW released the episode description for the January 26th episode of The Flash, appropriately titled "The Reverse-Flash Returns," where we see Matthew Metscher is back to play Eobard Thawne (Thawne is actually the true identity of the Reverse Flash as Thawne took over Well's body in the past).
HE’S BACK… — When Cisco (Carlos Valdes) gets a vibe of Eobard Thawne (guest star Matthew Letscher), Barry (Grant Gustin) and the team don’t believe it. But, after an attack at Mercury Labs, Christina McGee (guest star Amanda Pays) confirms that the Reverse Flash is back. Meanwhile, Iris (Candice Patton) and Francine (guest star Vanessa A. Williams) share a nice moment that brings Iris closer to her brother, Wally (Keiynan Lonsdale). Michael Allowitz directed the episode written by Aaron Helbing & Todd Helbing.
"The Flash" returns January 19th on the CW at 8pm ET starring Grant Gustin, Candice Patton, Danielle Panabaker, Carlos Valdes, Tom Cavanagh and Jesse L. Martin.