With U.S. stock futures trading lower this morning on Wednesday, some of the stocks that may grab investor focus today are as follows: Wall Street expects Johnson & Johnson (NYSE:JNJ) to report quarterly earnings at $2.70 per share on revenue of $22.31 billion before the opening bell, according to data from Benzinga Pro. Johnson & Johnson shares gained 0.5% to $151.80 in after-hours trading. Spirit Airlines Inc. (NYSE:SAVE) issued soft second-quarter preliminary revenue estimates. The company estimated total …