Can you guess who? That's a tougher question.
I think Kanapi has a good chance if she stays healthy.
That's a much much tougher question.
Mostly the last few years generally what has happened is that we have had two new top 10ers who have come very much out of the blue and are often from outside the top 20 or even the top 30 the previous year. Frequently they are players who hadn't even previously reached the top 20. Additionally they tend to be players who have been around a while, frequently in their mid twenties.
Players who fit that profile include, Lepchenko, Hsieh, Cirstea, Paszek, Shvedova & Suarez Navarro. Or possibly it could be a younger player like Ula Radwanska, Barthel, Halep, Watson or Robson. That's a few names there but there are numerous others one could also mention. That is hardly an inclusive list.
Personally I'm not convinced any of the players ranked in the top 20 who have yet to make the top 10 are going to do so next year. Kanepi is starting the year injured so that almost entirely eliminates her chances for next year. I wouldn't entirely rule out Kanepi or Makarova's chances for getting into the top 10 in the future but I don't see them doing it next year. Kirilenko, Cibulkova, Vinci, Safarova and Goerges all had very good years but I'm not sure just how much more they can improve. I think they all did very well to finish this year as well as they did. So yeah, I do think the next new top 10 players are going to be coming from outside this year's top 20.
I've just named a few possibilities but there are quite a few more. But what they all have it common is that right now they all seem very unlikely. But so did, Schiavone, Stosur, Kvitova, Petkovic, Kerber and Kerber prior to their top 10 breakthroughs.
It's very difficult to predict one or two players. There are many possibilities. And the thing is, most of them won't come anywhere close. But following the WTA for many years the one thing I've learnt is to expect the unexpected. And I do. I just don't know how the unexpected will manifest itself next year.
Probably by next February it will be clear that a couple of players have raised their games very considerably in the off season. It became clear pretty early on last year that Kerber and Errani meant business.