Mac App Store launching in January sans Game Center and in-app purchases?

"Less" and "later" are some of our least favorite words, but they may apply to the Mac App Store, as one source claims it will miss Christmas, and another says the marketplace will have fewer features than its iOS counterpart. First off, The Loop's Jim Dalrymple believes that December 13th isn't the magic date, claiming that his inside sources say the store will actually arrive in January -- which, we must admit, would still be within the window of Apple's October promise to launch within 90 days. Second and perhaps more importantly, 9to5 Mac reports that App Store developers are being told that their Mac endeavors will have a number of substantial limitations, namely no Game Center support, no in-app purchases, and no ability to offer demos, trials or betas. Sounds like those high-denomination iTunes gift cards you've been stockpiling in your basement will finally come in handy.