Thinking from a manufacturer's perspective, maybe the exchange rate and other external issues meant that the BE MSRP for 2013 was going to be bumped up to 100k+ regardless. If so, knowing that would result in a dose of sticker shock and tend to shunt buyers into the Pre, they preemptively decided to make the BE more exclusive in order to retain a following (albeit smaller) for this pricer edition. BE is mainly a cosmetic upgrade, so best way to distinguish from previous is a highly visible external modification, hence the wing. The wing is pricey but there were limited other options. SInce wing is used to spruce up the BE, and prop up its value, that consideration restricted use of same in the Pre. Hence we have the situation that we have.
Pure speculation, but might explain a few things, if (if) the pricing posited is in fact correct.
For what it is worth, I am knocking my head on CF in the hope that Nissan hedged the x-rate effectively and msrp comes in lower. And that those ceramic brakes come in much lower as well. Want, want, want, but unlike uncle Ben, a regular guy can't just print the money.