While you say they've been experimental since X, it's worth noting that XI and XII have seen decreased sales. VGC shows XII selling about 3 million less than X (unless anyone can find updated numbers from 7.95 and 4.95 million).
Looking at the limited install base the PS3 has and the obvious production values of the XIII videos we've seen, I doubt they're going to take many chances.
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While you say they've been experimental since X, it's worth noting that XI and XII have seen decreased sales. VGC shows XII selling about 3 million less than X (unless anyone can find updated numbers from 7.95 and 4.95 million).
Looking at the limited install base the PS3 has and the obvious production values of the XIII videos we've seen, I doubt they're going to take many chances.