This was the reasoning behind last month's name change to 'Dropbox Explorer'. And then it was all change again, for version 10.4 of the UWP application, with the name 'Dropbox Express'. And now we have v11.4, with the name 'Dropbox Cloud'!! You couldn't make this stuff up...
There has to be some kind of legal issue with using these names, though at least Dropbox Cloud also works to indicate the 'online client' use case, as opposed to 'local-cloud sync'.
The bump in version number to '11.4.3' specifically, over '10.4', does rather imply that it's similar code but with the name change warranting a major number bump, though at least there's something new, a UI change to remove bottom-of-screen 'mobile-style' controls and put them up in a drop down '...' menu instead, as shown below.
Don't worry, you'll find your way around, all the usual functions are there in every view, just shuffled a little into the menus.
You can grab this in the Store, if for any reason you don't already have it!
Any comments on the bizarre name changes?