Temp-tations is coming out with new sets of dinnerware (and all accessories) in their Old World and Floral Lace patterns constantly, and retiring older sets all the time too.
Once they retire a dinnerware style, it just isn't available, except on the secondary market, so if you break pieces or want to add more, they simply won't be available, unless you can find them on someplace like ebay.
So if you want Temp-tations dinnerware, be sure to buy an extra set or two because once retired you won't easily or cheaply expand the set or replace broken pieces.