Question about Extended Rotation

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With the new rules on blocks rotating out along with core sets being printed every year instead of every 2 years, it seems to me that on Oct 1st 2011, that M10 will not rotate out of Extended. The blocks in extended should have their corresponding core set with them. That being said, M10 belongs with the Zendikar block...and since Shadowmoor and SOA will also be in after Oct 2011, I see no reason for M10 to get booted out of Extended. I can't find an article or anything that confirms this though.

Anyone know for sure?
I am Blue/White
I am Blue/White