I'm sure it will have a reduced signature compared to its predecessor, especially against the updated and predicted threat list. As for the overall shape not changing that much, well the physics of RF propagation have not changed at all and same goes for the physics of atmospheric flight.
The large physical size of the platform gives it an RCS advantage over smaller aircraft when it comes to lower frequency threat systems and gives space for big fan engines, fuel, weapons, sensors and crew. Once you have the volume for those 5 requirements in an aerodynamic and low RCS package the remaining artistic freedom is limited.
Arguably the biggest change is the robustness, repeatability and maintainability of the 'stealth' coatings with a much-reduced cost-of-ownership.