Forza 4 did get them as DLC (I'm guessing Turn10 threw some cash at EA), PD should do the same.
It is just not that simple.
For some reason - that nobody knows about and I still haven't managed to get the info about it despite years invested in trying to figure out the whole thing - Electronic Arts has some kind of special deal with Porsche (Porsche Lizenz- und Handelsgesellschaft mbH & Co. KG) regarding exclusive rights to use, manage and sub-license the Porsche vehicles for use in video-games, non-platform dependable.
That license has never been ceased (despite numerous rumours it will during past 5-7 years) and it is still valid.
During time, EA games (Need For Speed main games & spin-offs, and latest, Real Racing MOS games) were the only games that had Porsche vehicles when EA decided to grant the use. Worth noticing is how that *licence* covers even modifying the appearance and damaging the vehicles, as we could see in NFS: Shift games (Works modification comes to mind).
We learned from Forza Motorsport 4 how usage of Porsche in Forza was result of some deal between two sides: Microsoft & EA. Speculation was how they *traded* licenses: Microsoft granted EA the rights to use their Ferrari license for the Shift DLC exclusively on X360 while EA granted MS to use Porsches in Forza 4 - also as an DLC only. The "catch" was how because of the some reason usage of Ferrari licence on PS3 is even more complicated, because the licensing has been shared in-between Polyphony Digital (for Gran Turismo games), System 3 (they still can sell their Ferrari The Race Challenge over PSN, which means their license is still valid), Atari (Test Drive Unlimited 2 had multi-platform Ferrari licence and Atari used the licence to publish the Ferrari Race Legends by Slightly Mad Studious as multiplatform (PC, PS3, X360) in 2012), Codemasters (for F1 games only, usage of Ferrari is negotiated separately from other FOM-covered rights) and SEGA (as timed-usage for Outrun games, which can't be bought over PSN for years now when license expired).
Because of the above, EA was not in situation to offer Shift Ferrari DLC to PS3 players (or maybe it didn't want to, due to deal with MS).
However, it is very interesting to learn how Porsche-BUG in Forza 4 has still not be fixed (players who don't have Porsche DLC can't even see Porsche cars in game is used by other players) and *maybe* it has something to do with the license.
Of course, there is interesting story regarding infamous "AUTOMANIAX" project (now cancelled) that appeared in 2011 (?), but was never made out of the beta-phase. I learned how Automaniax was in-fact actually licensed by Porsche, but only for racing vehicles - and pitched by SMS. However, the guys who were producing "Automaniax" did something wrong and because of the unknown reasons - we don't know which ones - project never become a reality. It was planned as showcase-product only, never to be available on consoles for instance, so maybe that was the reason why they even succeeded to grab the license in the first place.
So, to make a breakdown:
- Porsche multiplatform rights are owned exclusively by Electronic Arts
- Microsoft had some kind of "sub-license" for Porsche on Xbox platform, granting it to their developers based on title (Project Gotham Racing, Forza Motorsport series)
- Codemasters also had some kind of rights to use few Porsche models on both PS3/X360 GRID
- at this moment only EA has rights to deploy Porsche in their games on PS3
- on PC almost noone OFFICIALY uses Porsche since 2007 and GTR2 game which used only racing models, probably inside general FIA-license. Porsches were excluded from 2008 GTR Evolution game (made available only as "mod skins" later). Only 2 PC games with Porsches (that were not EA games) were TDU2 in 2011 and Ferrari Racing Legends in 2012
We know Kazunori is great fan of Porsche and we can presume he would be very happy to have it in GT series from every reason imaginable. But everything probably has to do with willing of EA to allow the usage (all until Porsche decide it will license the rights directly to Sony/PD *one day*).
If so, then all I can do is quote Angst:
EA's HQ:
CEO: "If we don't license the Porsche license to Polyphony, the fans will instead buy our iPad game with nice visuals, ridiculous gameplay and wonky physics"
Boardroom: *standing ovation"
Of course, third scenario is also possible, where Porsche was willing to allow Sony/PD (I think how license-holder is always Sony (publisher), PD *only* uses all licenses as developer) to use the license, but Sony (PD) imagined how proposed price was unjustifiable from some reason. But everything on that matter will be pure speculation until some real info become known, if ever.