It appears that Boeing is looking to extend the life of the F-15 Eagle with a technological update (also here and here) called the Silent Eagle.

The two most obvious changes are creating weapons bays in the conformal fuel tanks and the canted tails, though it is also reported that there is a fair amount of radar absorbent material (RAM) added, including a frangable gun cover that hearkens back to how armorers treated the guns in WWII.

There are apparently no radar blockers in the inlets, even though Boeing has extensive experience with them in the F/A-18 E/F, because of potential export issues.

This implies that Boeing has decided (correctly IMHO) that they have no chance of selling these to the USAF, who have eyes for nothing for the F-22 and F-35.

They are suggesting a $100m unit price, though it is not made clear in any of the articles as to whether this is unit price, or fly-away cost.

The implication is that $100m will be cheaper than the F-35 JSF, and perhaps this is less an exercise to sell more F-15s than it is to sell more F/A-18E/Fs by implying that the JSF will break 9 figures in cost.

If they are implying this, they are probably right. The JSF shows a lot of signs of cost escalation and schedule slippage.

Powerpoint courtesy of The DEW Line, video of missile actuator courtesy of Boeing.