North Star is at Mariucci Arena, and 10,000 Lakes is at Williams (site of last year's regional). Both are located on the campus of the U of M. Mariucci is the ice arena, and Williams is the basketball arena. And yes, they are right across the street from each other.
I don't know about smaller, my understanding is that they will both be roughly the size of the single regional last year, maybe slightly smaller. I believe there will be 50+ teams at each regional. Should be a pretty crazy weekend, I can't wait!
Here is the link to the YouTube promo video for the double regional:
http://www.youtube.com/watch?v=NrCJJ2JHnEU&fmt=6
I don't know any more specifics on the cRIO seminar, but you may want to ask that question in the forum section of the MN regional website.
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