As much as Qatar has other major logistical issues - number of cities, temperature, alcohol - I give them credit here. The stadiums look awesome and the concept of splitting them in half afterwards is a great one - this is the kind of arrangement I suggested for Tasmania, for the Australian bid - build a 45k stadium in Hobart just for the World Cup, then relocate half of it to Launceston afterwards. 2x 20k rectangular stadiums.
One question - two of these stadia are listed in Doha. They haven't announced where the 60k and 80k venues will be - you would expect Doha. How many venues will the city have?