Definite changes

Users will be divided into User and Member classes, where User represents a global user and Member represents a user on a server. This is both cleaner and easier to do because Discord already separates these two things in the API.
WebSocket connections will be using a wrapper class instead of Faye/WSCS directly. This lets me switch both WSes to WSCS which doesn't rely on EventMachine (and if I'm dissatisfied with WSCS I can switch to something else entirely).
Caching code will be separated into a module and redone somewhat
Some stuff will be made more consistent, like server vs guild
The bot initializers will be restructured to only have an arguments hash that specifies everything
Removal of all the deprecated stuff

I will also support any changes to the API when they come out, like sharding.

Possible changes (from more likely to less likely)

Queueing system for voice playback
advanced_functionality off by default, it seems to cause more problems than it is useful
Voice receive (depends on whether I can get the sockets to work...)
LightBot class that only has a REST connection (hard because the current code relies heavily on the existence of caches)