Some of the spiciest news to leave the Apple rumor mill this month tells us the company plans to release a 15-inch MacBook Air. Actually, it might not even be called a MacBook ‘Air,’ but it would at least offer a lighter and cheaper alternative to the 16-inch MacBook Pro for those who would like a big screen on their laptop. It’s not the first time we’ve heard this rumor, but it seems increasingly likely to be true thanks to recent reports by Display Supply Chain Consultants and Apple tipster Ming-Chi Kuo. Unfortunately, such a device might not arrive until…