From what I recently read in the Splash Cover Game Informer for ME the are going to keep the current system with tweeks. They said that the destruction of the Normandy and Shepard were a reason to make those changes and they don't want to go with a complete overall ut they did say they will be modifying this system to responds to the lack of role playing aspects that were the major criticism of ME2. Sounds like good news. The say they are also modifying the mineral scanning And not to expect the Mako hammerhead to make a full time comeback as it was in ME1. If you ask me Mineral scanning should be pretty darn perilous with Reaper running around.