The part number for this is 62302361627, and the price is around $450 (....and about the double of that in Norway
).
Unfortunately, there's still not that much information around regarding this, so I don't know which cars it can be installed in. According to my dealer, it can't be installed in an e6x 5-series, but you can never trust dealers.
Edit: According to
this site, it will work in e8x 1-series (and e9x 3-series for that matter). I can't however see how that big plate thing can be mounted nicely to the rather round cluster housing the 1-series have.
It seems like the navigation data only can be transferred from Garmins navigation app, and not the iDrive system which seems a bit odd, and stupid for that matter.