serious question, Can the PS4 beat the Wii U LTD by the end of the year?
I higlhy doubt it
It should sell 1.2 million (more or less: 1.7 - 500k) with the Wii U selling zero.
Actually they are selling almost similar qeekly quantities; Wii U is getting MK8 and SMash (I presume) within the year (two big sellers, potentially), and even last year the console saw a Christmas holiday effect. PS4 to me has much more potential, but up to now it seems that for 2014 it will have few Japanese heavy sellers (considering how PS3 is still getting exclusive interesting games, like Tales of).
So, if we imagine to see PS4 selling better than the Wii U because of more games incoming, but the Wii U having a slighlty stronger holiday bump and two "system sellers" (compared to the Wii U usual weekly sales) I'd say that it will be hard for PS4 to match the Wii U LTD by the end of the year