I have a few things to say. You did a pretty good job but, you shouldn't assign negatives to races like they did in second edition. You can use the goliath race in sword coast for half giants, because that's what they are anyway.
Also Bits are not a coin. They are literally pieces of a ceramic coin. The coins can be broken into up to 10 pieces (i.e. bits).
Now for the warlock class, I agree the 3 patrons in the PHB can really be in Dark Sun, but the Pact of the Immortal can be. I would impose the limitation that that is the only pact and they are automatically defilers.
Now the question is how will wild talents be distributed with the characters? How many points will they get or will their ability be they can use the power a certain number of times a day? The reason this question needs to be answered is because, if you give them points, there will have to be enough to use the power at least once a day, so that would mean at least 7 points. If that is the case, what happens if someone rolls a weak power, or one that you can spend up to 7 points? They can spam that power at least 7 times a day. If the power is x times a day, then what number will that be, 1,2,3 times a day? I think we need the final version of the mystic class to come out before we do this, but I would like to see this world come back.
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