That tail is not of a B-variant but an A-variant.
New AESA radar, New HUD, new MAWS, new RWR, new HMD/S, new EW suite, Longer wingtip rails for new WVR missiles, new BVR missiles, 3-axis FBW, increased fuel capacity, more composites in the airframe makeup, an extra hardpoint for targeting and EW pods, Cruise missile carrying capability, apparently a new optical Data link/Bus (MIL-STD-1773), new software and avionics, possibly a new engine with increased thrust (93MA) and FADEC, possibly an OBOGS or further increased oxygen capacity, among many other minor things…but everyones hyped for slightly redesigned wings That will basically add nothing to the aircraft. It’s such a massive upgrade Already. I wish people would focus more on these details.