It's somewhat unclear how the next-gen preorders are doing relatively to each other. It's probably assumed that PS4 is outselling Xbox1 in the US right now, but there are no solid numbers to back this up. Only biased info from MS or Sony are released stating that their pre-orders are doing well.
However, the PS4 game pre-orders are substantially outpacing the Xbox1 versions. Battlefield 4 has twice the total pre-orders on PS4 compared to Xbox1, but this week, the PS4 BF4 outsold Xbox1 BF4 by almost 5 to 1. Watch Dog PS4 is dominating Watch Dog Xbox1. Most games are doing better on PS4 with the exception of COD Ghosts. COD Ghosts Xbox1 barely edged PS4 version this week, but total preorders are still bigger for the PS4.
Currently, looking at the pre-orders for the next-gen games, it seems that PS4 console sales will almost double Xbox1 consoles sales (barring any manufactoring supply issues).
