Looks like it's going to be gog keys going by the forum.
Correct:
Project Update #72: Oh my GOG!
Posted by Chris Jones & Aaron Conners Black heart (cards) Like
Greetings Mutant League!
TEX IS BACK! For two days now, can you believe it? By now, you should have received your Steam code for Tesla Effect.
There has been a lot of hubbub about the GOG codes, so lets clear that up.
We had requested GOG codes for our Kickstarter backers early on. However, by the night the game was supposed to launch, we had not received them yet. It was a choice of whether we wanted to make the backers wait for the GOG codes, or simply send everyone a Steam code to access Tesla Effect. Since we wanted you guys to be able to play the game the first day it came out, we opted to send everyone the Steam code. However, the good news is by Thursday we received GOG codes. We are currently sending out emails with GOG codes to members of the Mutant League. It will be about 24 hours before all the emails have been sent out, so remember to check your inbox (and your spambox!)
People who are at the Beta Level Testing and above tier already have the game on GOG so will not be receiving new codes. The Beta on GOG can be updated to the full edition of the game. For instructions on how to "refresh your shelf" on GOG, please visit:
https://secure.gog.com/account/refresh
We respectfully ask that you dont share the codes with people, and continue to enjoy "Tesla Effect." Have a great weekend!
Best,
Chris