I thougth about this some time ago but what I would like to see the passing of Day and Night in ALL the worlds. Instead of some worlds always being daytime and some are always nighttime like Marleybone.
The only problem is time zones. While it may be nightime in your area, it could be broad daylight at someone else's house. This would make everything difficult.
I like the idea of night/day and even weather (snowing, raining, storming); however, tethering it to the real-time clock isn't a good idea: if one typically plays during the same hours (say 1800-2000), then they won't experience the variety.
To ensure variety, the game world would have its own clock that deliberately does not match the earth's clock.
