Apple Gazette has received a tip from an apple insider that the Mac OS Aqua User Interface will be replaced with a new UI named Illuminous.

The source goes on to say that we will see a demonstration of Illuminous at Macworld 2007.

The gensis for this rumor started earlier this year when Apple posted a position on Monster.com seeking a senior visual interface designer “to conceive, design and develop future enhancements to Aqua, the dynamic user interface for Mac OS X”.

This is the first time a name for the supposed Aqua replacement has been given.

What will Illuminous look like?

That’s anybody’s guess at this point, but we might be seeing some hints of what Illuminous holds in the recent release of iTunes.

We will keep you posted as more information becomes available.

UPDATE: Interesting bit from MacShrine. They state that a new build of Leopard was seeded to employees on Friday. What’s interesting, as it relates to this rumor, is the following bit of text:

“Apple continues to gloss over the interface, refining it even more and there is an overly presence of black gloss.”

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