Many apologies for the vague headline and further apologies for the fact that it's entirely possible nothing interesting is going to happen.  But here's why I say it's possible:

Long story short, we just had the most actively-traded minute (in terms of 10yr futures volumes) even as 10yr yields held fairly steady.  Meanwhile the yield curve looks like it's considering a break below the pivot point established last Friday (July 20).  Think of it like a ledge or shelf that acted as a floor after last Friday's spike.  If the curve moves back below this shelf, it could be good for 10yr yields, and this higher volume combined with the shelf-ish levels suggest that's an imminent possibility.  

10's are currently down just over 1bp at 2.94% and Fannie 4.0 MBS are up 3/32nds (0.09) at 101-23 (101.72).