When I was in Dublin, I visited the little yarn store called This is Knit. It was a lovely little place, I picked up some sock yarn and needles for my mother-in-law, who had mentioned how much she liked my hedera socks. Knowing that she already had enjoyed a little knitting in the past, I didn't need much more encouragement than that to get her started on a pair of her own.
While I was there, a young girl (no doubt from Ravelry, although I was too shy to approach her), was talking to a man who could have been the owner or he could have been the Rowan rep (I was too shy to approach him either). The ravelry girl asked the rep 'so what's new in yarn?'.
He said that Rowan yarns were on the verge of releasing a brand new yarn made completely from .. wait for it .. SUGAR CANE!
A google search reveals nothing .. so if it does come about in the future, remember you heard it here first kids.