If they ask for any updates at the interview, you must be honest and provide all relevant changes for such changes, in my professional opinion.
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I wouldn't worry about this anymore, Amigo.. The time for the consulate to ask for the affidavit of support supporting documents has now passed (that was done at the NVC level, remember?) Thus, unless the consul again brings up the Affidavit of support issue, and asks you questions or asks you to "update" the co-sponsor's financial information (which I don't think will happen) you are in good shape.
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If he shows proof of income that is overly sufficient, as opposed to a paper loss (the loss of selling the property) it may not matter. But if you are concerned you should speak with a immigration attorney directly.