This is the galaxy map found in The Force Awakens: Visual Dictionary,
sorry for the bad quality picture.
You can see Rakata Prime included among most the canon planets and they even chose to include Rakata Prime over Kamino and Mustafar.
As some of you know already, Rakata prime is a planet from KOTOR that had extreme significance. I realize that, based on this answer, KOTOR was somewhere between C and S canon.
Taris was mentioned in Star Wars: Aftermath
They stand in a tenement on Taris...
Malachor is mentioned as Kylo Ren's lightsaber is said to be patterned on a Sith lord called "The scourge of Malachor".
- Darth Bane is featured in an episode of Star Wars: The Clone Wars (TV series) (can't remember which season/episode)
So what do these fairly direct references mean for the level of canonicity of Knight of The Old Republic?
Note I am not asking for plot speculation (as delicious as it may be) based on these developments, also I do not believe this is a duplicate of the question I linked as this question is based on modern developments.