Directional Bias For The Day: S&P Futures are higher; trending up since 8:30 AM on Tuesday;  moving sideways to down since 7:30 AM Odds are for an up day – watch for break below 2689.00 for change of fortune Key economic data due: Prelim GPD (3.5% vs. 3.6% est. and 3.5% prev.) at 8:30 AM Good Trade Balance (-77.2B…