Based on a R1100GS
8 page article on it in the new BMW motorcycle magazine. It's only available by subscription here
http://www.bmw-motorcycle-magazine.com
Has good articles and photos. Issue 1 has tests on the G650X range, K1200R Sport, K1200GT and a R100RT v R1200RT

plus a look at the history of the RT. There is a fantastic 15 page technical article on the 800 twin engine, A look at the Krauser MKM 1000 and a feature on touring in Bavaria amongst a lot of other interesting features.
Produced in Germany by BMW enthusiasts, the english is slightly entertaining but that doesn't distract from what is a quality publication.
Check it out, I don't think you'd regret a subscription.
A word of warning if you do subscribe, pay by credit card and don't take up their offer of sending an invoice. I did and my bank wanted £25 to make an international money transfer
A couple of emails resulted in a very nice Fraulein phoning me to take the card details, but it is hassle you don't need really.
Nick