The category “Construction” under Infrastructure has been split into three sub categories:

• Construction sites: landuse=construction, highway=construction, building=construction, railway=construction and all items with a tag prefixed with ‘construction:’.
• Proposals: landuse=proposed, highway=proposed, building=proposed, railway=proposed and all items with a tag prefixed with ‘proposed:’.
• Developable areas: landuse=greenfield and landuse=brownfield.

Further updates:

• Public transport amenities: Now includes airports (although I’m considering creating a whole “Aeroways” category and move them there)
• Individual Traffic / Maxspeed: now include maxspeed=walk (cyan) and maxspeed=none (magenta).

Example of the “Developable Areas” category: