There are several good resources for info on the sort of raw diet that Steve is doing. Dr. Graham's foodnsport.com is a good one (check the faqs), and there are others around.
Dr. Graham recently answered the potassium question on his Raw and Sports Forum on Vegsource.com. His answer was that our kidneys are great at removing excess potassium, so there are no worries about that if your kidneys are healthy. And if your kidneys are not healthy, then you've got a lot more to worry about than excess potassium.
Good luck on trying this diet. I highly recommend the 80-10-10 diet book as a resource. Also, Roger H. (sorry, don't remember how to spell his name) seems to really know what he's talking about - Steve's mentioned him in his blog, and he's posted several times.
As for the worries about focusing, I'd recommend starting at some point when you have a long weekend. The worst of the foggy-headedness (for me, of course) happens about 3-5 days in. So start on a Wednesday or Thursday so that the worst is during the weekend. And plan ahead - do any big reports or projects in advance, for example.
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