For those earning >= $250,000 Essentially your taxes REVERT back to the Clinton era tax rates ( from 36% to 39.5% ).
On F&F they said Schumer had suggested limiting the tax increase to those making over $1 million, but they indicated he might switch to Obama's position. For a family living in New York City, $250,000 doesn't put you in the ranks of the super-rich or afford the lifestyle it might in the South or Midwest.
Only the top marginal rate. However, there will also be increases in dividend and capital gains taxes.
Looking back at 2003, you can see how the tax cuts affected the average tax rate for everyone:
But, it didn't really affect the share of income taxes paid by the various income groups. In fact, the higher income taxpayer ultimately paid a higher share of income taxes, at least until 2008: