WWDC Banner Revealed?
Core Duo (Yonah), currently used in today's iMac, MacBook, MacBook Pro, and Mac Mini computers, is a 32 bit processor whereas Core 2 Duo (Conroe/Merom) and Xeon are 64 bit. A recent page 2 rumor indicated that in addition to a Mac Pro introduction, the MacBook Pro may be updated to include Merom which would leave only Apple's consumer systems with 32 bit processors.
Also of note is that most of Apple's most sensitive banners at events are typically heavily guarded and draped with black cloths until the related announcements are made.

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