Enjoy your time in Switzerland! Zurich is on the other side of the country compared to me; Chateau de Chillon is as close as you will get.
If you are thinking of travelling quite a bit around Switzerland, especially in a block of days, you may want to consider a Swiss Travel Pass or Half-Fare Card. No need to purchase them in Australia - you can buy them in most large railway stations in Switzerland.
How are you approaching up the Matterhorn? Directly, or viewing it, e.g. from Zermatt?
If you have time, you may like to consider going to Aletsch to see the glacier. Hiking from Bettmeralp down to one of the lower towns is a nice experience, too.
Given your proposed travel, everywhere will be German speaking except for Chillon / Montreux, which will be French.
P.S. Bring money.
:mrgreen: