I don't think it's a question of "new forms of artistry" coming in later in the year, I think it's more of knowing the choreography better and filling in any gaps as the year goes on. As examples, both Kimmie and Emily at SA had that "We just put this together 3 weeks ago" look (and in Kimmie's case, she HAD just put it together 3 weeks ago) and it showed. Emily's program, just one week later, already looked a lot more "together" and polished. As one becomes more comfortable with the choreography, in theory, the program should look more complete as the season goes on. And if you haven't had something that long, all the intended moves usually aren't going to be ingrained into your brain that soon, so in the early going a lot might be left out.