Well, I have an online page where all of the floor browser files are stored, and when I want to add more floors to the browser, I just have to add it to those files and after adjusting the online information, the new floor will appear in the browser without the need of an update. This is also how I can update existing floors that are in the browser.
And when the ability to submit a floor gets added in Beta 1, you'll probably be able to select what floor you want to upload from a list which will then send it to an online location where I can review the floor before deciding whether to add it to the floor browser or not.