Async SQL
Async core code
Async scriptsystem
Ability to utilize the best reactor designs (epoll (Linux), iocp (Windows) and kqueue (FreeBSD))
Ability to utilize JIT using PyPy
Very flexible core
Very configurable core
Very fast save format (save takes from less than 0.1ms to 0.3ms per player, scales over several sql connections, allowing for upto 10k saves per second)
Sector maps, dynamic load and unload for optimal memory usage (down to ~50MB on 64bit after login! (32bit can expect around half)) (*Multilingual mode may require more)
Support for instances or even having multiple worlds on one server!
Support for multiple languages (at the same time, now each individual account can have their own language!) (*all server sided messages, client UI is a different matter)
Ability to dynamicly script maps and custom items!
Multiple protocol. The distro supports multiple protocols, currently from 8.54 to 9.81
Web Client. Now you can play a ots your browser.