Since these are AC's prime transAtlantic routes this is where TANGO will be launched for the summer sales period. I am sure we will see a major announcement in early March to this effect. The big question, as you hint, is whether TANGO fares on these routes will earn 50% mileage, and if these miles will also be non-status miles. tcook has also posted of the arrival of these fares in his thread on the super-fare to CDG.