Oh, come on. The Democrats will introduce a bill in Congress to keep taxes from going up on people making less than $250k a year. They've already said that. What's more, the Republicans will support that, too -- you think any GOP Congresscritter will want to face his constituents and say, "yes, I voted to raise your taxes, 'cause those danged Democrats wouldn't keep the taxes on the Wall Street banksters from goin' up at the same time"? Heh -- they're not that dumb.
No, taxes in the lower brackets will not go back up.