A quick search showed that the message was referring unambiguously to this (the image below the message was the same symbol which appears at the top of the article), and Google turned up this, suggesting that the message has somehow been edited into other Wikipedia pages, though not necessarily in the conventional manner.
Curiously, upon re-checking the edit history pages, the message had disappeared.
The message was as follows. The actual message appears to contain a variety of fonts, so some of the characters may be incorrect.
"You people seem so smart" seems like it could be a reference to the Wikipedian community or even xkcd, which if true would strongly suggest to me that the message was written by a prankster. If not, it is possible that the encrypted message is related to one of the original ones sent by the actual Zodiac killer in the 60s.This is the Zodiac speaking. You people seem so smart, yet I get away with so much. Here is a letter for you smart people:
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