It looks like Reverse Flash is coming back to The Flash in Season 2.
Yes, Eobard Thawne is returning to the series and will not be played by Tom Cavanagh but by Matthew Letscher, the actor who was the REAL Thawne in the first series.
In Season 2, Episode 11 Thawne will return to cause Team Flash a world of trouble.
The CW released an official synopsis:
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 (#211).
“The Reverse-Flash Returns” airs on January 26th, 2016. We’ll update this with more details when we get ‘em.
Source: Den of Geek