Just wondering , wasn’t the a350-1000 supposed to come right after the a350-900 like the current 772-77W?
The developers have not said anything regarding the A350-1000. It may come in the future, it may not.
In addition, you can read Jason’s comment about the aircraft:
No. That is something that people gathered from a high amount of speculation. When/If it is announced it will be done through the official channels. Blog post, announcements, etc.