[Yossarian]

Let’s play “spot the differences”:

1) Longer nose? (Could be the lens used to photograph affecting that);
2) Tail fins are at an angle;
3) That big bulge by the air intake and lack of outer pylon tells me weapons will be internalized;
4) Is there a more “radar protective” downward angle on the top of the intake than before?

[TokuMei]

More detail:

http://www.youtube.com/watch?v=8pWhKHrz28k

[ErnstStavroBlofeld]

F15Eagle, Any comments?

[Yo-Yo]

Let’s play “spot the differences”:

1) Longer nose? (Could be the lens used to photograph affecting that);

Yup, optical delusion.

2) Tail fins are at an angle;

Yup, on that non-flying static prototype, but if Boeing funds a flying prototype, they've said the tails will remain parallel for now.

3) That big bulge by the air intake and lack of outer pylon tells me weapons will be internalized;

That big bulge is the conformal fuel tank, and is also used on F-15E Strike Eagles. Boeing modified the CFT to include an internal weapons bay.

4) Is there a more “radar protective” downward angle on the top of the intake than before?

The intakes are powered, and they tilt up and down depending on aircraft airspeed and angle of attack. This is normal for every F-15 all the way back to the A model. Here's a picture of one "winking:"