You beat me too it, I was just about to post the same article

.
What I like about this better than the XM-8 is the larger caliber foremost. Definitely a significant improvement in terms of performance. Also, the M468 is said to be more reliable under combat conditions. And it has a bayonet mount

.
The M468 also appears to be made out of metal. Another point in my book.
The barrel length is 16", 4 inches better than the XM-8 and that is also a significant inprovement. It is also 4 inches shorter than the M-16.
I like it. I just wonder how it really performs.