Back to the OP's wish for terrain notification. I had asked for a similar addition to the splash screen when all of the arenas are shown. I thought this might help to familiarize the players with the different maps and names. If the names of the maps appeared next to ping (for example), players could readily identify which map is in rotation. In the case of special events or custom arenas this information may indeed help in a faster dl from home page rather than servers.
Having all of the splash screen information available on the homepage, could go either way. It could encourage players to join in, and it could also influence players not to bother, if current numbers or map are not "fluffy" enough to draw them into the game.