MBS are holding steady at the moment with no change over yesterday's pricing (from the end of the day, which ended up fairly well). Currently the 5.5% coupon MBS is at 99-21 /22.
Market movers today will be stocks and any potential headline risk. We are coming off a great afternoon yesterday, so if the tone in the Dow stays downbeat, we could extend those gains. If, on the other hand, the Dow is boomy, then MBS could give back much of their gains from yesterday afternoon.
On these days with no economic data being releases, be careful about volatility as one negative headline can send the market into a tailspin very quickly.