There are a number of questions posed by this rather thin list. Let's examine them:
(a) The PD site is titled Track List. It does not say that this a
complete list. Kaz could be playing tricks with the fans!
(b) The list only includes a few tracks not revealed in the leaked video: Nordschleife and Top Gear.
(c) IF the leaked video represents arcade tracks available at game opening, then is it likely that only two tracks would be opened by challenges?
(d) The number of snow/dirt tracks seems very weak.
(e) There is no mention of the cart track.
(f) Why mention Eiger short track if there is no long track?
(g) Why did Kaz affirm that the list would top 100 tracks? Even with variations, this list does not approach 100 venues.
On the other hand, there is the distinctly disappointing possibility that this is the final list. Why? Let's speculate:
(a) The HD tracks require so much disc space that there was no more room for additional tracks. (Remember the multi-disc set photo revealed last year?)
(b) The switch to 3D required even more disc space.
(c) DLC is planned either because of disc space issues or as a revenue generator.
Either way, we'll find out shortly!