Oil passes 140 $/b; Experiencing a change in sentiment

Comments from Libya oil minister on possibility of 170 $/b in summer affected almost everything today. A generally weak dollar, possibility of raising interest rate in Europe as soon as July, and political dispute between US and some OPEC members have been mentioned as the reasons. Oil passed 140 $/b in New York for the first time, dollar depreciated against almost all majors, and more importantly the US equity indexes plunged about 3 percent in the worst June since the Great Depression.

The question to me is that whether conditions have started to change fundamentally and gradually or it is just a more psychological reaction to a daily comment; is it possible to see GBPUSD at 2.000 again or the current 1.9890 is the best time for selling sterling?

I think it may be right to expect that a relatively more stability in oil and other commodity markets is needed to ensure that day to day calculations are based on a solid ground.