This has been hashed out many times over the last 18 months but IMHO replacing the 6.2L doesn't make sense as the 6.8L (based on F150 & Mustang applications) will have an aluminum block which won't work in the SD. And even if they did, specs are so close to a 7.3L why bother? 6.2L was old and already around, price point offering. But were all speculating so I guess we'll find out...