This
developer page gives a few minor hints about some software additions we can expect.
"Hello self-combusting selfies" is perhaps referring to a SnapChat-like non-permanent picture message that's only temporarily available to the recipient.
"Hello rain in five minutes" seems to refer to improvements in the Weather app along the lines of near-casting or now-casting, which offers improved and more detailed short-term forecasts based on recent and current observations.
Other less interesting ones seem to be about sport deals (Baseball) on AppleTV, some watch stuff and some fitness stuff which could be AppleTV or Apple Watch-related or both (integrated).
But we know most people just want to see the hardware!