The DEMO!!!

At first I was really baffled by its size. More than 12.5GB of storage was needed to install it. That's about the size of Forza Motorsport 4 with Disc 2 included.
But therefore you get to taste five tracks:

• Circuito de Rio de Janeiro (with two layouts I think)
  
• Lime Rock Park
  
• Indianapolis Motor Speedway
  
• Yas Marina Circuit at Night (also with two layouts)
  
• Sebring International Raceway in the rain
  

All of them are very fun to drive. Especially the last two. Driving Yas Marina at Night was really cool and at the loading screen the announcer mentioned that the grip level differs between day and night due to lower track temperatures at night. But actual proof wasn't there because only the night version is included in the demo.
Sebring in the rain was also great. There are puddles on some really difficult points of the track, making it really hard to control e.g. a 2015 Corvette Z06 especially when not using any assists.
You can barely steer while driving through them and your car gets very likely to spin out when taking a puddle in a wrong way. But after a few laps you are getting used to the situation and don't end up in every barrier that is out there .

All in all the demo is made pretty well and now I'm pumped for the full version.
Fingers crossed that it isn't filled with bugs and XBL issues

wohoo