As of today, WWE Raw superstar Kofi Kingston is not booked for Wrestlemania 26.
When Drew McIntyre was added to Money in the Bank on Smackdown last week it bumped the participants in the match to 9. The expectation was that Kofi would be added as the 10th. However, that did not happen this week on Raw, and in fact Kofi was squashed in the main event by Batista.
Kofi has some heat backstage due to an incident with Randy Orton in the ring in a match on Raw earlier this year. In the match, Kofi popped up too quickly from an RKO, angering Orton in the ring. At this point, it looks to have cost Kofi a Wrestlemania payday.