I know that HipByte isn't currently working on statically linking in Swift classes. I've asked.
Swift is intended to be open sourced which means that it is theoretically possible, but considering it's a completely different runtime, it's non-trivial.
This doesn't bother me too much right now. But as CocoaPods start getting released as Swift-only, we're going to start losing ground in the RubyMotion iOS world. So, someday, this is going to need to be addressed, unless we re-implement every popular Swift pod in RubyMotion gems.