Only way to get fully functional JB is if Motorola gives us a JB rom (doubtful) or they unlock our bootloader. Beside that we might get some hybrid of it using an ICS kernel. That JB kernel is more important than people give credit. Without it I don't think we will ever get a fully functional and stable Google Now. I am sure the JB kernel also has a hand in how Project Butter work. The only use over ICS I see is having better widget handling while have other important things broken.