X is probably just so fucking far off for us that they're not going to include it.
Yet the new Zelda game, which is seemingly still at a conceptual stage, is included.
It should be noted that titles confirmed to be coming are not in the list (Rayman Legends and RE:R for the US and Europe). So there may be mistakes in that list.
It says "Extracts" right in the title of the third-party list. It's not meant to be an exhaustive list. Now, the first-party list does not have such a qualifier...