Stocks were around the flat line at Wednesday's midday trading as investors wait for the release of the Fed Minutes. Both the Dow and S&P 500 dipped into negative territory after strong gains. Tesla (TSLA) was up after upgrading its Model S. The flagship electric vehicle now offers a larger battery pack and all-wheel drive. Lululemon (LULU) stretched higher on the back of an analyst upgrade. The yogawear maker is now rated at BUY at Sterne Agee. After the bell, the first quarter earnings season unofficially kicks off when Alcoa (AA) reports. The aluminum giant is expected to earn $0.26 a share.