Developers and others poring over the second Developer Preview of Mac OS X 10.7 "Lion," released earlier today have already uncovered a few changes, including alterations to iChat and a dramatic new look for iCal, reports The Next Web. The latter now matches the revamped Lion Address Book in sporting a classic, historical "real-world" look, specifically a leather-bound, hand-stitched design that goes beyond the luxurious look of some iPad apps, while iChat has consolidated it's improved connectivity into a single window.