You are looking at the estimated dates those forms will be available for printing to file, or to efile. While changes could still be made (and actually, well after those dates too), the forms in the product right now are useful for estimates. Schedule D, 1099-B, 1099-DIV were in the Windows desktop product as originally released.
I've been using TurboTax for decades, and I'd say that 90% of the time I spend using the product is between mid-November and late December. Preparing a return for filing in Feb/Mar/Apr is the easy part for me.
