The US does have an expatriation tax[1] that is of concern for many. There was also a dramatic increase to the tax proposed as a result of Eduardo Saverin's expatriation before the Facebook IPO. Even though he hadn't been living or working in the US for some time prior, the US imposes taxes on all moneys a citizen earns, regardless of where they are living, or where that money was earned.
Beyond that, expatriation from the US is at an all-time high[3], and the rumor is that it's related to the adoption of Obama's progressive taxation schema.
That, the "Buffet Rule", the reduction on charitable donations, the increase on capital gains, and his proposed "Grand Bargain", which lowers rates, but eliminates enough loopholes that it is at least expected to raise the effective tax rate for corporations.
As I don't net more than $1 million a year, I hadn't followed it very closely, but I admit that I'm a little surprised. For some reason I thought it had most certainly passed and been enacted.
Beyond that, expatriation from the US is at an all-time high[3], and the rumor is that it's related to the adoption of Obama's progressive taxation schema.
[1] - http://en.wikipedia.org/wiki/Expatriation_tax#United_States
[2] - http://en.wikipedia.org/wiki/Ex-PATRIOT_Act
[3] - http://www.thefiscaltimes.com/Articles/2013/11/18/US-Taxpaye...