According to multiple anonymous sources, Apple's next installment of Mac OS X (named Leopard) will arrive in mid to late April with an exact shipping date being announced later this month, perhaps alongside Adobe's Creative Suite 3 event.
While the sources are anonymous and cannot be confirmed at this time by other known and traditionally reliable means, agreement from such a variety of sources is rare. Still, Leopard's release has been prone to much hype and speculation, and we hesitate to place too much hope in such rumors (yet).
The latest seed of Leopard, released to developers March 2nd, showed progress but still had many serious bugs waiting to be exterminated.