Yes, it will.
The Galaxy S4 and Note 3 will receice KitKat 4.4.2 sooner or later.
It could take a few months, possibly when 4.4.3 or 4.5 comes to the market.
EDIT: At people saying that because GS5 has it, the rest should not have it, the GS5 was not that big of a hit this year. There will be a GS5 Prime and Note 4 which Samsung is relying on. The GS5 will continue to get updates longer than the others, too, so it's not that much of a deal. It's just a matter of look. The GS4 does not have the features of GS5, so it wouldn't decrease the nr. of sales of the current flagship.