For those of you being spammed by "The Ice Stone has melted!" message, it seems, at this stage, to be a bug. There are a lot of thoughts that it's related to Uldaar, but apparently all inspections of the entrance show no ice stone.
A blizz posted on forums said this:
From what I gather, Plytor, this is only affecting realms that currently have the Love is in the Air event running. At this time, this would only be Oceanic realms, due to the time differences, but we should be seeing more about his later on tomorrow.
We are gathering more information on this issue, and will do what we can to get a resolution for it as quickly as possible. Thanks for the heads up, though, mate. :o)