I'm currently working on updating the servers to have support for UUID's.
What is a UUID?
A Universally Unique IDentifier is a fairly long series of hexadecimal numbers commonly used in software to uniquely identify something. With Minecraft, Mojang is planning to use UUIDs to identify player accounts, with each Mojang account tied to a UUID. For example: Notch's account now has the UUID "069a79f4-44e9-4726-a5be-fca90e38aaf5".
Uh, What the hell did you just say?
We're adding support for future name changing in 1.8, basicly.
This might take a while, But I'll keep you all updated.