The White 1 shown below has been most played.
Kono says that a pincer is absolutely called for. For Black to answer on the lower left side would do White's bidding, and White would joyfully sprawl up the right side, looking daggers at whatever position Black constructs at the top. He gives a couple of examples of low pincer josekis starting with Black A and B, but we have only seen examples of A. Kono was rather taken by the high C, which was played in Game 5 of the 33rd Meijin for a very good reason (not just tight underwear), and high D, which he does not discuss, has been played even more often, probably for the same reason.
Above is an example of a low pincer. The pincer at A is about 10 times more common than Black 1, but it has not appeared in this position in actual play, probably for the reason that Kono rejects it. White can play the shoulder hit at B, and White has to answer at 1, as C would be overconcentrated, and he then has to face the prospect of further reducing moves up the right side. The significance of that is that White is thus building a springboard for moving into action on the upper side. But with the wider pincer at Black 1, Black would be perfectly happy to answer a shoulder hit at D with a push at B.
Incidentally, this seeking after the unobvious move (Black 1 here) has a special word in Japanese go, and it is very common in pro talk. It is 工夫 (kufuu), which normally means 'scheme', 'invention', 'expedient', but the dictionaries are a bit sterile here. In chess we might refer to such a move as a 'prepared move', and that sense applies also in go, though it is not really a trick move. Rather, it is more like 'thinking outside the box'. We mention this mainly because doing just that was perhaps the main bit of advice that Fujisawa Hideyuki was giving the horde of top players who turned out for his Shuko School in the Youtube video that has been talked about recently (April 2009).
It will be evident from the above that Black would probably prefer to avoid a White shoulder hit on the right side altogether, and that was apparently the thinking behind Black 1 below. As this was the first time it was played (though the wider high pincer at A was already known), this was clearly a case of a kufuu by Cho U, who played it against Iyama Yuta in the 2008 Meijin title match, and then again a month later against Kono Rin in the Tengen showdown - clutch situations but with success in both cases.
Still, as Kono points out, it is early days yet and White players will no doubt find some new ideas of their own.