SCEE president Andrew House has called motion-sensing an "essential" element to PS3, speaking to GI at E3.
"That's one of the essentials," he said, talking of PS3's wand-based motion control system premiered in LA earlier this month.
House was quick to expound the machine's further virtues, however.
"But the PlayStation 3 is also one of the best Blu-ray players around for high-definition movies and that almost gets lost in the mix," he added.
"That gives it an enormous sense of longevity, people want the best if they are buying into high-definition entertainment from a television standpoint or from a movie standpoint. That's an inherently long lifecycle and it helps bolster the traditional gaming lifecycle as well."
There's a full interview through there.