Yes and no, depending on how you count
"No" if you meant audio connection proper -- only streaming via Bluetooth is available (as stock). "Yes" if you consider being able to read files off a USB drive and play them back as "an audio connection" -- there is a USB cable in the right pocket.
If you're playing back from USB, then the Skip Next/Skip Previous buttons will do what you expect: skip to the next/previous file. If you're streaming from Bluetooth, those buttons will send AVRCP events which, of course, will only be acted upon by your device if it supports the protocol.
It's worth noting that the audio unit itself does have a stereo AUX input and a stereo headphone output, but they are not cabled at the connector. It should be possible to craft something (aftermarket people, can you read this?) but we still have to reverse engineer a way of selecting "AUX" as the active input.