The only 4.4 ROM out right now is for the Columbian Wi-Fi version. It could be the same ROM as for other markets or it may not be. Magazine UX is still on the N10.1-14 microsite where it first appeared after the Pro's started shipping. It may mean something or it may not.
http://www.samsung.com/global/microsite/2014galaxynote10.1/feature.html
If it does end up permanently missing I won't be too upset. When M-UX was first shown at CES I thought it was cool because there were a ton of widgets and you could create tiles for any installed app. In and of itself it could have been a potential alternate UI. What was released with the Pro's was completely neutered. From three home pages with one being the main home screen it's been reduced to one tagged on at the end of the traditional TW home pages. Most of the widgets left are just modular pieces of My Magazine which means it went from being a hidden pull-up to mandatorily consuming a home page that could be used for other things instead. I use all my home pages so wasn't keen on giving one up to M-UX in its current state. It's not even called Magazine UX anymore. It's now "Content Home."
There is a downside. I was kind of hoping the N10.1-14 would have been made s/w compatible with the Pro's to increase the frequency of updates received. If M-UX and other UI-based features from the Pro's have been left out we'll end up being an odd duck and 4.4 might be the last major update we see. It certainly won't help update timing, that's for sure.
Time will tell...