blackxs, I am no expert, but from things I have read there are usually a few years of vastly different performing engines and technology/engineering between teams after the new formula regulations are set. If this is true, I would expect the next few seasons to be quite interesting as we see how each team engineers their 1.6L turbo. They will easily get 750HP+, but all in different ways.
To quote someone else, the responsibility of F1 is to open doors to the future. In this case, as the market has been shifting, the future is turbos. This change will lead to the most efficient and highest performing turbo engines ever. If the rules said 2-stroke diesels, we would have the best darn diesel engines you can ever imagine.
Also should mention that the 1.6L turbo engine is not as simple as you might think. 2013 will be a simple core turbo, but in 2014 the regulations open up to any type of turbo. I would expect to see many teams run turbo compounding. Still no word yet if there will be a limit on boost.