One more quick note...
I have done business with large-scale Japanese companies for many years. It is very common for a Japanese company to study their competition in gory detail -- they are not ashamed or concerned about how it may look. They will openly ask brazen questions (that often simply cannot be answered without giving away corporate secrets), observe, and take copious notes. They do this for one reason -- they are sizing up the competition and looking for anything that can give them an advantage. Rest assured that if the Devs came by, they are acknowledging Forza 3 as a genuine competitor and they want to learn more about the product before they release their own just in case they miss something really cool or obvious that would be easy to emulate or implement in GT5's final release.
It may be that PD didn't find anything that concerned them. It may be that they liked some of the features. It may be they just took notes about what they saw so they can discuss it at a later meeting. I guarantee, however, that there was or will be shortly a meeting within PD to discuss what they saw and strategies may or may not be developed or implemented.
Just how do you think the Japanese have beaten so many "inventors" at their own game? It is their methodology. They have taken many technologies invented in other countries, studied them, and then perfected them to the point of destroying the competition... See history. Cars. Cellular Phones. Laser-Read-Disks. The list is very long... In the end, the Japanese have studied the competition and one-upped them. I'm sure PD has the same intentions...
I hate trolls.

Systems I currently own: 360, PS3, Wii, DS Lite (2)
Systems I've owned: PS2, PS1, Dreamcast, Saturn, 3DO, Genesis, Gamecube, N64, SNES, NES, GBA, GB, C64, Amiga, Atari 2600 and 5200, Sega Game Gear, Vectrex, Intellivision, Pong. Yes, Pong.