I dont know about the double spacing issue...I really find it unlikely they did away with it completely. Reading that many essays if they are single spaced would be tough not just because of the tighter spacing but also because a two page essay could be close to 2,000 words with a little formatting. An increase in applications would make it tough to get through everything if they allow two pages single spaced. Especially when you consider the fact that they shortened the lengths of the essay 4 by a paragraph Its possible but I would personally work with double spacing for now. Its easier to add length than to cut it down.
Remember they only posted questions not the actual application so directions may differ.
Maybe one of the applicants on here will make a call to the admissions office to get the scoop.
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Kellogg Class of 2010...still active and willing to help. However, I do not do profile reviews, don't offer predictions on chances and am far to busy to review essays, so save the energy of writing me a PM seeking help for these. If I don't respond to a PM that is not one of the previously mentioned trash can destined messages, please don't take it personally I get so many messages I have a hard to responding to most. The more interesting, compelling, or humorous you message the more likely I am to respond.