Oh. I thought it was going to be next year because of the release schedule on the other two films. Thanks for letting me know.
The films have always been released 3 years apart from eachother. TPM was released in May of 1999, AOTC was released in May of 2002 and Episode 3 is due out in May of 2005.
Same went for the Original Trilogy: ANH was released in 1977, ESB was out in 1980, finally followed by ROTJ in 1983.
Unfortunately all of them have been three years apart, so we've still got a couple years to go for some more fun. Those spoiled Lord of the Rings and Harry Potter fans get to have their fix every year. Not fair!