Query: SPU development and Bucket Information?

I have a few questions.

What do the fields in the TileSortBucketInfo structure mean? I
understand the meaning of the hits data member, but what are the
pixelBounds, objectMin and objectMax data members for?

My second question is, can I SPU change it's "super" at run time? For
example, lets create a SPU with a NOP SPU as it's super, but later I
want to change it to a passthough SPU. Can I do this?
What would be the technique?

Thank you for your time,
James Steven Supancic III

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