Information released by the Department of Energy (DoE) on the program states that it "has a similar primary design to the W87-0", which could be evidence that it is like the previous W87 mod 1 program in that it has a different or modified secondary to produce a higher yield.
The Department of Energy (DoE) released information about the program stating that it shares a similar primary design with the W87-0, suggesting it might be similar to the previous W87 mod 1 program in its use of a different or modified secondary component to achieve a higher yield.