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How do ‘Sphinx’ invoice-less payments on the Lightning Network work?

There was recently a WIP draft published to the lnd Github, for a ‘Sphinx payment mode’ for Lightning Network nodes. To quote Roasbeef from the Github PR:

Though this is a WIP, it can apparently be used on mainnet already, as long as all nodes involved are upgraded to include the new code.

So how does this work? At a high level, what does the UX look like? At a low level, what differences are there in terms of completing the payment (passing HTLCs around), compared to a standard LN transaction? Whats going on under the hood?

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