Hi Tommy
Last year a USB stick was launched for Tyros 2 called the Reggi Stick, which amongst others included new sounds, styles and set ups, including the control and interfacing of additional keyboards, Pedals and a Genuine Leslie cabinet for the organ sounds, and it was made available through the Yamaha Club.
Reggi Stick Plus is apparently a much more advanced version, however apart from the details I have posted, there are no more details are available.
When it is launched later this week, details will probably be put on the Yamaha Club web site, also SZ members attending the Festival will most likely post about it when they get home.
Hope this makes it clearer

Bill