Yes, Starkiller is in the running for a return. Many popular characters from the extended universe have found their way back into the Star Wars timeline. A great example is Thrawn, EU fans celebrated and gave the animated series Rebels a much needed boost of fandom support.
Coincidentally, Lucasfilm’s Dave Filoni had actually developed a storyline for Galen Marek, the man who would become Starkiller, to appear in Rebels. Although, this didn’t happen, there is obvious attention being given to the character.
Check out this great video from the Stupendous Wave for more detail and background on Starkiller’s return.
https://www.youtube.com/channel/UCdIt7cmllmxBK1-rQdu87Gg
