News just in from Japan: in its July issue, Best Car magazine is reporting that Lexus will reveal a sportier variant of its LS 460 luxury sedan at the Tokyo Motor Show in October. The magazine claims that the car will carry the SZ moniker and that it will feature a subtle aerokit that includes a new grille treatment plus uprated Brembo brakes and BBS alloy wheels shod in chunkier tires. The LS 460 SZ is estimated to cost in Japan between 9 and 10 million Yen or around to $100,000 US.
There's no mention of any upgrades under the hood so it is possible that the SZ may simply be a special Japanese-market model / trim-level. But as is the case with these kind of rumor-reports, we'll just have to wait for Lexus to come out with something official before we make any definite conclusions.