There has been some discussion about the species mentioned in News Update, the Kr'Thak, and the Krell mentioned in the Kickstarter Krell system unlock announcement. Are they one and the same, or two totally separate alien races?asked by Hardsblade

So, well, I think people just got confused because essentially the Krell system is where the Kr'Thak come from. So that's why people got confused between the Krell and the Kr'Thak. And maybe you would call them the Krell because they came from the Krell system, but their proper name is Kr'Thak.