First beta will contain:
1) Fully ported extended NFSU Olympic City
2) Some vehicles from Juiced 2, Most Wanted, Carbon, Undercover, edited in the same style and using the same generic textures so it doesn't look like a default car pack from different modmakers.
3) Graphic setups for low- and high-end PC
Things like car sounds, traffic (and maybe ped) routes, all cars with tuning and online mode will be released as updates later. Keep up with the upcoming updates