It's just a short article, but it does give a little insight into the development process. http://news.bbc.co.uk/newsbeat/hi/technology/newsid_7926000/7926506.stm (apologies if this is a repeat)
They say that Oliver receives 70% of the sales of Rolando. I assume NgMoco also gets a share of that 70% though!
Never knew it was a Brit who made that, go him! It also says the price is £2.99, but it was actually £5.99 at the start.