Just got my up-date this morning on Rogers, in Toronto. 150mb like the rest. I too was disappointed to see it is still 4.4.4, but on the other hand, better to work out any issues with 5.0, 5.1, 5.2 etc. before loading it up on a device which for the most part does not have any significant issues now. I noticed that the date of at least one component was January 2015, so it is not entirely the old 4.4.4.
I have also heard that there are battery issues with 5.2
Like any reload of the os it should run smoother at first with everything loaded in memory in precisely the way it should.
It may mean that it will be a while before Lollipop is certified and adopted by Samsung for the Note 4 or else why bother with this relatively minor tweak of 4.4.4?