The new Ford RWD/AWD platform has been locked down for about 6 months. The same platform is being used for short wheel base (Mustang, dead Jag F-type), mid wheel base (Falcon, Lincoln LS, Jag S-type) and long wheel base (Jag XJ, Marqis, Fairlane / LTD) for model releases after 2003.
Current RWD platforms are being progressively changed to accept components from the new platform such as a common IRS. The next Falcon / Fairlane is about to inherit the S-Type rear and I believe it is going under the next release of Mustang as well. Falcom gets new platform in 2004