Don't know, if anyone has seen this, but speedmaniacs.de (German site) brought an article a couple of days ago about a joint Assetto Corsa-Porsche event recently at Vallelunga, the occasion being their cooperation with the newly released Porsche packs in AC, and Porsche using AC Pro in their Porsche Experience Centers.
The report about the event is very interesting and quite lengthy, but one interesting part that is of general interest for all racing games is part of the conversation with Sebastian Hornung (Manager Branded Entertainment at Porsche)...
My translation:
How does a small team like Kunos Simulazioni manage to acquire the licence from Porsche when Electronic Arts holds sort of exclusive rights? According to Sebastian they were also always following what was going on in the gaming industry aside from EA. The licence with EA runs out this year, because together they arrived at the realisation that the current situation was not desirable anymore. Therefore the relationship also with other game developers will change. After 10 years of absence from pure simulations there is a desire to diversify what is being offered.
Asked about the situation with manufacturer RUF, who uses chassis from Porsche and refines them, Hornung reluctantly admits that they didn't foresee their popularity. He also is even more uncomfortable about the fact that there are no racing cars from RUF, although in many games virtual versions of a RUF-equivalent to the 911 GT3 exist. Sebastian brings into consideration that this is by no means "a real Porsche".
Link to original article