This new category shows kerbs (the edge where a road meets a sidewalk). Read more about this in the OpenStreetMap Wiki. The category uses the colours from the Wiki page. Popups will show additional information: type of kerb (lowered, raised, ...), they wheelchair accessibility (if set), if the kerb has tactile paving and the height.
The new "Footways" category (under Transportation -> Walking) shows sidewalks, footways, steps, platforms and pedestrian zones. Sidewalks mapped on the street way (sidewalk:left, sidewalk:right resp. sidewalk:both) will be shown with an offset - hatching indicates the relation.
An exciting new feature: "Custom Categories", which can be created and edited from within OpenStreetBrowser. Watch the video for a short introduction: https://youtu.be/I0x4Kwz6u90. Also, check out the tutorial!
Also, there are a few new Twig filters: 'json_pp' and 'yaml'. Check the documentation for details!
From now on, it's possible to write categories in YAML format. This is much easier than JSON and allows for comments. You can find a few example categories in the documentation on Github. There's a repository with these examples in the OpenStreetBrowser Development environment, which you can fork (you can load this under the big ➕ icon on OpenStreetBrowser).
Parcel lockers are a newly approved feature in OpenStreetMap. They are now included in the "Communication" category with a box symbol. I also included the deprecated tags vending=parcel_pickup;parcel_mail_in, vending=parcel_pickup and vending=parcel_mail_in. These will render with a bright red symbol to indicate deprecation, also there's a warning in the popup.
Recently, I added a new category, which shows all heritage protected items (at least those, which are tagged correctly in OpenStreetMap). Additionally, I created a web-application which helps tagging heritage protected items in Austria (and Berlin, Germany). I blogged about this here.