Hi,
The presentation simply shows an Apple Airport Express connected to the AUX input of the Encore,so basically, it will work with anything (BeoSound or BeoVision) fitted with an audio AUX input!Even a 20-year old BeoCenter.. or a VX7000 VCR..
On the BS5, if you want to go that way, there is now a special phono-to-USB adaptor that lets you use one of the USB inputs on BeoMaster 5 as an extra -analog - AUX source.
I find the interest really limited, since you'll get poorer sound, more cables and no display at all on your BS5, just for controlling playback on your Idevice?
Reunion Island is greeting you!