Bring the miniature platinum discs to the gates of Uldum in Tanaris and look for clues as to the connection between the two.
We want you to take the miniature discs you found to the sealed gates of Uldum. We... we aren't sure what will happen when you do this.
This sounds risky, sure, we acknowledge that. It might, however, do nothing. You might need to use the discs on something. Perhaps the doors unlock when you have the discs in your possession. Be open to try anything, and be ready for anything to happen.
When you've found out what happens, return to Ironforge. We'll have a lot to analyze when you're done!