I think "enough" actually works better in your example. Though the meaning is obvious, using "much" makes it sound a little awkward and not like a native speaker.
If you were to use only the first part, then "There isn't much information yet" would work well.
You could think of "enough" as meaning "the correct amount." "Enough" really needs something to go with it. It's a correct amount for something... Enough food to eat, enough information to make a decision, enough medicine to cure. You can often leave out the other thing and people know what you mean by context: "I have enough food" is perfectly reasonable as food is usually for eating.
"Much," on the other hand, does not require anything else. If you have much information, then you have more than a little. "There isn't much information yet" is valid on its own. The reader (or listener) doesn't even have to know there is a decision to be made for that to makes sense.
I'm having a hard time explaining it. This example might illustrate the difference:
There isn't much information on that new game yet, but there is enough information
leaked to know it looks interesting.