Hey John, great for you! I'm fortunate to have ridden a bunch of Edelweiss tours, including in the Austro-Italian Alps, so it's quite possible I have ridden with one of your guides. They're all personable, but can appear quirky if you're not used to European sensibilities and humor. My thoughts follow:
Buy John Hermann's "Motorcycle Journeys Thru the Alps" (must be in 5th edition by now). This will answer many questions and is great fodder for daydreaming your trip, as Hermann describes in considerable detail the passes, towns etc. you will be hitting. The 200 page Edelweiss booklet has loads of great info, and I think gives great advice as opposed to "marketing speak". Don't hesitate to contact them with any questions. Also, RideADV.com has lots of great advice for overseas tour preparation.
Your tour is rated at 4 stars both for difficulty and riding time (personally, that's the most demanding tour I would take) -- you likely won't have any problems sleeping at night! Be aware that Edelweiss riding pace is quite rapid outside of the towns and thru the passes. If you are not strong in riding switchbacks & hairpins (in traffic) you might seriously consider enrolling in the 1-day Alps Prep Course. That also gives an added day to get acclimated to your bike (if diff than your current ride) It also let's you assess bike condition - it's much easier for them to slap on new tires, etc. at their shop rather than on the road. A Total Control class here in US could be good too. If the tour group pace is too fast (or too slow) to your liking, let the guides know. If one asks they have been known to divide into two groupings -- two-up/sight-seers vs the pinned throttle crowd.
Prepare for weather variation. Make sure you have waterproof gear - it will
rain. The high passes will be cold and the valleys can be warm - on the same day. We rode on light snow over Grossglockner Pass in July. I carry rain jacket/pant's and layer them over Gore-Tex for warmth.
The food and beer/wine will be phenomenal. You won't see Starbux or MacDonalds once you leave the airport
Eat the local foods - who knew lamb lung stew was delicious!
I plan to be at the club mtg at Battleys and at Bobs Model Launch on 3/25. We can talk then if you want. Scott