[Shaun @ Tru6]

The article mentions the S3 and 1-series as potential competitors in the "hot hatchback" crowd. And we can speculate that Porsche has three paths of development:
1. A hatch version of the Cayenne per Les
2. A direct competitor to other luxury hatches per Matt
3. An early VW GTI-inspired theme

of course there are more, but these are what may be kicking around Porsche engineering, design and marketing.

My question of why you would think Porsche would build a heavy hatch is based on a recent Road & Track article:

"Adding a high-performance Quattro version to a particular model has for many years been part of Audi's policy. It adds prestige and attracts a class of keen drivers who otherwise would probably not have opted for an Audi and who communicate their enthusiasm to friends and prospective buyers.

The previous-generation S3 was discontinued early in 2003, and it took three years for its successor-based on the current A3 hatchback-to arrive.

One could have expected it to be powered by the 250-bhp 3.2-liter V-6 as used in the new TT and also in the Volkswagen Golf R32, but Audi engineers were concerned about weight and instead opted for the much lighter turbocharged 2.0-liter 4-cylinder FSI unit powering the Golf GTI. But this delivers only 200 bhp, not enough for the performance they had in mind. Hence came the decision to utilize a larger turbocharger, capable of raising the boost pressure to 16.8 psi and the 2.0-liter engine's power to 265 bhp."

I can only speculate that Audi engineers concern for weight was not limited to engine choice, but applied to the entire car.

I can't really say if Porsche engineers are still concerned about weight, but I think that if they want to create a performance-competitive hatch more in the 911 tradition than the Cayenne, a 3000 pound hatchback at a competitive price is within their abilities. After all, a base Caymen is around 3000 pounds. Why Porsche would build a heavier hatchback than a Caymen is beyond me.