well i've always said PS4, Nextbox, AND WiiU, would have even market share but i was indeed wrong.
Sony has EU on lock this time around, with likely very little resistance from Wiiu in JP.
WiiU will likely fight Ouya for 4th lol. WiiU will start to sell when Nintendo releases there big ip, but i don't think it will be sustainable.
nextbox will do well. NA i feel will treat nextbox and PS4 the same depending on exclusives and COD which the gap in that arena is closing. i'll just rap this up by saying the gap will be no more then 0-10m either way if Sony plays their cards right.