Alright, the "so far in 2013" figures have been updated for both the US and UK.
UK has the PS4 at 7th and the XBO at 70th:
http://www.amazon.co.uk/gp/bestsellers/2013/videogames/ref=zg_bs_tab_t_bsar/279-2285307-5597923#2
US has the PS4 at 2nd and the XBO at 8th:
http://www.amazon.com/gp/bestsellers/2013/videogames/ref=zg_bs_tab_t_bsar/279-2285307-5597923#1