Some mysterious "Onzo" bikes have turned up in the CBD.
Image source: DarrenDavis10 on Twitter
No announcement, no press releases, no fanfare. Barely even a website from what I can find; they do appear to have a Facebook page along with an app for you to use the bikes. Fee is $0.25/15m, and you get $10 bonus for signing up. But yeah, quite mysterious as to where they've come from.