On the Hyperion blog, Steven Solie said:

"AmigaOS fans may have noticed an abundance of updates appearing
lately. There is also an updated SDK should be appearing soon as
well.

One of the reasons for all this activity is AmiWest 2013. The show
itself is October 19 and 20. There is also a “Classic Clinic” on
the Friday night before the show where Amiga technicians will be
available to help get your Amigas up and running again. AmiWest is
also featuring a programming conference from October 16 to 18. The
plan is to continue where we left off at AmiWest 2012 and focus on
building useful applications with a GUI. It is the programming
conference which is driving the bulk of the updates. We want
everyone to be at the same API level and have all the latest
updates so we don’t waste any time on working around any fixed
bugs (for example).

Many AmigaOS core developers and beta testers will be attending
AmiWest 2013. This is your chance to chat face to face with the
experts that are building and maintaining the genuine Amiga
Operating System. Hyperion Entertainment is also sponsoring the
show and will have a table setup with various AmigaOS-based
systems on display. See you there!"