This is debateable as to whether it's strictly a LEGO topic, but thought it might be of interest and I don't remember seeing anything about it.
Ever since I got back into LEGO, I've had a hankering to build a rollercoaster, and the day when my Technic/Mindstorms/System mashup comes to life is surely only a matter of time...
Anyway. Was in the Watford store yesterday, and picked up a couple of issues of BrickJournal, and in the Sept '13 one, I read an article about Adam Reed Tucker (of LEGO Architecture fame) who has teamed up with a small company called CoasterDynamix. They make small model rollercoasters, Tucker's been thinking about it for a few years, and suggested to them that they might want to make it LEGO compatible.
LEGO are keeping an eye on it, and while it's not 'canon', they've been allowed to package it so it looks remarkably similar to official LEGO products.
It's a relatively small set, just giving you the rollercoaster mechanicals, while you have to build the bulk of the coaster from your own parts, but it looks sufficiently interesting that I've bitten the bullet and ordered two of the limited run of 1000 sets.You can see more about it here.
It might be the start of something big, it might be destined to be a tiny footnote in LEGO history. Who knows?