Based on UKMix's estimates, that would give the half-mil sellers this year as:

01 - 988k - 1989 - Taylor Swift
02 - 810k - IF YOU'RE READING THIS IT'S TOO LATE - Drake
03 - 594k - IN THE LONELY HOUR - Sam Smith
04 - 565k - 50 SHADES OF GREY - Soundtrack
05 - 551k - X - Ed Sheeran
06 - 541k - TITLE - Meghan Trainor

Here for 1989 ruling the year.

I'm really hoping the margin between 1989 and 50SOG is big enough so Billboard doesn't reverse the titles again like they did last week. I'm sick of seeing that soundtrack hanging around up there, especially when HDD gives Swift the lead the day before.

Top 5 streak saved for Taylor and outdid the prediction easily.