Yes, bidders can preview the online auction items before bidding starts during the Auction starts on and ends on dates; otherwise, the auction page is not available and the Message to display when online bidding is not active (which is customizable) displays.
Auction "preview" dates:
Auction bidding dates:
Auction is not active message:
On the Auction webpage when it is not active:
On the Auction webpage when it is available to preview: