Thanks to @DougChasman we have learned here that both ToolingAPI and MetadataAPI are fully supporting AuraDefinitionBundel and AuraDefinition right now as BETA and we can start to use them.
Now I would be very interested, if there is also a bit of documentation about Aura regarding ToolingAPI. As with other Metadata-Types, I'd like to support both APIs switchable, wherever possible.
Or has anyone already saved an AuraDefinition as single File via ToolingAPI? I would prefer not to deploy the entire Bundle but only save e. g. MyAppController.js - is that possible?
Probably I could answer most of my questions to myself by looking at Dave's https://github.com/heroku/force - but if anyone already used ToolingAPI for Aura deployment, any insights would be appreciated.