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U.S. index futures point slightly lower open. Asian shares rose while stocks in Europe fell as energy producers got caught in a downdraft in oil prices and reversed an earlier gain after Goldman unexpectedly warned that WTI could slide below $40 absent "show and awe" from OPEC. The dollar rose, hitting a four-month high against the yen and bonds and top emerging market currencies were back under pressure on Tuesday, following last week’s hawkish rhetoric from central bankers.

Some potentially displeasing "Sunday Start" thoughts to market bulls, from Chetan Ahya, Morgan Stanley's global co-head of economics, who warns that in light of the recent "hawkish tilt" by central banks, the message is clear: "central banks are more watchful of financial stability risks: It is in this context that central banks now appear to be keen to lean against easy financial conditions so as to pre-empt the rise of financial stability risks.

An advisor to China's central bank, Sheng Songcheng, said that virtual currencies like bitcoin are assets but do not have the fundamental attributes needed to be a currency that could meet modern economic development needs. Speaking in an interview with financial magazine Yicai, the PBOC advisors said that the adoption of Bitcoin as a national currency by a country "could lead to its economic collapse."

The South African rand has tumbled following a report confirming recent speculation that South Africa’s ruling African National Congress will propose that the country's central bank, the Reserve Bank be nationalized and wholly owned by the state, according to three people familiar with the discussions quoted by Bloomberg.

S&P futures were little changed at 2,425, ignoring the N.Korea tensions of the past two days which will likely be a major topic in the upcoming G-20 summit, as European stocks fluctuate and Asian markets advance. Crude oil fell, snapping the longest winning streak this year, as Russia said it opposed any proposal to deepen OPEC-led production cuts.