You'll be fine. The power stays very controllable. If its too much, you can easily detune it with the programmer.
I don't know why we see long threads discussing performance on the stock WR450s. Everyone knows they are plugged up and detuned. First steps on the 2012+s should be to install the competition ECU and remove the throttle stop bolt. There is no use discussing issues before that occurs.
The next steps to more performance are reprogramming the idle mixture, replacing/modifying the stock exhaust and then programming a different map into the ECU. After that its time for YZ cams.
This sequence of operations allows one to set the power of a 2012+ WR450F to anywhere between 20ish HP (stock) to over 50HP and tailor the throttle response to just about anything the rider desires. It doesn't get much better than that.
There isn't much info on the new fuel injected bikes in the FAQ thread.
I mean I knew the bike would be plugged up. But my WR250R would run circles around it and even in stock form it wouldn't be that much further behind the WR450F. I couldn't believe how much it was not just physically corked up but also detuned.
Where can I find info on adjusting the idle mix?
Will the YZ cams move the power band further up? I don't know if I'd want to lose out on the low end.
2014 WRR lots of mods R.I.Pieces
2012 WR450F in the process of modding