With the rumours of an available V8 and a longer car, this new IS would seem to me to be an all-new, TNGA model. Otherwise, why invest engineering resources into retrofitting a V8 and lengthening an old platform that may only serve for another 2 or 3 years?
So why no more leaked information about this new IS, including spy shots?
Could it be that Toyota/Lexus (and all of its engineering employees) is really good -- really very disciplined -- at hiding its new vehicle development, and then only intentionally leaking bits and pieces when the corporate bosses want to (and not allowing any employees to leak any new product information)?
Could it be that Toyota/Lexus has top-secret development and test facilities that auto-critics are not aware of (like that jokingly rumoured secret test facility under Mount Fuji)?
Could it be that the auto media (including the spy photographers who lie in wait for new test models to drive by their hiding spot) really do not care about new, upcoming Toyota and Lexus models?