Some Observations:

I saw a Foxnews story that the sales of very high end luxury cars is booming.  I have stated that high estate taxes encourages conspicuous consumption.  If you are going to give a large portion of your accumulated wealth away, then why not blow it on the Bentley instead.

At the same time that they want to encourage such high end consumption they want to  restrict deductions, including charity.  Even if you want to argue the morality of giving based on tax deductions, you can not ignore the mathematical reality that the higher taxes reduces the amount available to give to charity.

Income at the lower levels is dropping. One reason is the growth in part time work at the expense of full time work in order to avoid the penalties of Obamacare. Read Part-Time Workforce Surges Ahead Of ObamaCare Mandate: Gallup.  This has been widely predicted since the bill passed.

Thomas Sowell has noted that the claims of widening disparity in income is fraught with statistically misleading and inaccurate statements. One of these is the focus on categories instead of real flesh and blood people. In Townhall, Sowell notes in Economic Mobility,

Most working Americans who were initially in the bottom 20 percent of income-earners, rise out of that bottom 20 percent. More of them end up in the top 20 percent than remain in the bottom 20 percent.

People who were initially in the bottom 20 percent in income have had the highest rate of increase in their incomes, while those who were initially in the top 20 percent have had the lowest. This is the direct opposite of the pattern found when following income brackets over time, rather than following individual people.

I have recently noted the divide between Wall Street an Main Street, here and here. Also read Wall Street, Gloomy Main Street May Both Be Right.

Taking all of the above into thought I would expect the income disparity to widen under Obama and his policies intended to achieve the opposite outcome.