World Currencies
First, lets check how all currencies did in 2012. Here is a brief summary of the top 10 currencies for the year. As you can see the emerging markets had the highest performing currency.
http://soberlook.com/2012/12/the-2012-winner-for-best-performing.html
Bitcoin
However, there is one currency or commodity that is missing from this list...namely Bitcoin. Overall, Bitcoin was up remarkably in 2012. It opened the year at $7.00 USD / Bitcoin and currently stands at $ 13.54 USD / Bitcoin. This calculates Bitcoin return at 193.4% YTD.
Gold
If we compare how a similar commodity like gold performed in 2012, we see the following return on investment. Overall Gold began the year at $1560/oz and currently stands at $1663/oz. This calculates Gold return at 6.6% YTD.
Summary
So, does this mean that Bitcoin will continue to appreciate in value for 2013?
It's unclear at this time that will happen, however the future of digital currencies seems bright considering the pending problems with traditional fiat currencies like the US Dollar, who's economy is headed for the "fiscal cliff" with only 3 days remaining in 2012.