Every copy of FM4 comes with those tracks via a free DLC code, just like (I think it was) Sidewinder with 3. Guess it's to curb second hand sales or something.
My take on the new 'Hood announcements:
25 Autovista cars: With such a fairly low number, it seems more like a gratuitous tech demo that was bundled in rather than enhancing the depth of the game. Such a small number also decreases chances that each DLC will have one AV car included (which I personally was envisioning).
Unicorns: Fuck them. I never had the chance to drive the S204 in Forza 3 because it was a unicorn, now I won't be able to drive it in 4. Perhaps have them as cars you may get for accomplishing certain (maybe left-of-center) tasks, but not as something you actively have to find. And given that I stick mostly to single player in almost all the games I own, it's like they're punishing me for my personal preference (despite having a full gold XBL sub).
Shame about night/rain, but it's not a massive loss IMO. It would've been near impossible for them to do it with the quality I've come to expect from Turn 10, so it's good that they chose to skip it.
All in all, not that crushed about some of the things but the unicorn cars concept really, really pisses me off.