Just because there was a lot of call volume it does not tell you anything. You cannot tell if they were buy to open sell to open. IN other words, an institution or large player could have sold a ton of calls against a long stock position to collect more premium or someone could be loading up on long calls. No real way to tell and guessing does not really get you anywhere either so, GM is still a company that makes large gas guzzling cars less efficient than foreign cars and has billions of pension liabilities and makes more money lending money (GMAC) than building cars. THhhhpt!
Phil