About in-line with the time between SP1 and SP2, the next rollup update for Windows XP is scheduled to come out sometime after the release of Windows Vista, a little more than a year from now. Though this is quite a long time to see another large update, the majority of updating and securing XP will still come through standard windows updates. There are some
rumors about what may be included in SP3, including possibly WinFS, originally scheduled to be released with Vista but delayed. WinFS is the metadata-style filesystem designed to be the successor to NTFS.