Optimism trickled into the stock market Wednesday morning on reports that the U.S. and Iran are accelerating efforts for peace talks. "Be cautious," argues Kevin Green, at least until Iran itself confirms the talks about happening. In the meantime, he explains how the headlines crushed crude oil price and lifted airline stocks. Also on KG's radar: Arm Holdings (ARM), which rallied double-digits overnight after announcing a new data center CPU chip.