Saver Day Passes?

Yes, the Saver Day Pass is new.
It is basically valid on all trains, buses and boats, same a a Swiss Pass, with exceptions for mountain Railways.

The catch is you must buy in advance, on the internet. Up to 60 days in advance, and as the date approaches the price goes up.
Details here: https://www.sbb.ch/en/travelcards-and-tickets/tickets-for-switzerland/1-day-travelpass/saver-day-pass.html

Good for all transportation for a particular day. Except high mountain stuff like the Jungfrau, and some of the scenic high mountain trains. Website is clear on ehats covered. You might be able to buy Saver day passes but they are for a specific train. If equal in cost, the day pass gives you more flexibility

Karen, you say the saver day pass is for a specific train.

Do you mean a time-specific outbound only itinerary of trains to a destination or do you mean time-specific round-trip itinerary?

I think she is referring to Supersaver Tickets, which are train specific.

I think that is a typo on Karen's part I think she means a Supersaver ticket

Supersaver Ticket = Advance Purchase ticket from A to B. Only valid on train listed on ticket. Sold for the less popular trains
Info: https://www.sbb.ch/en/travelcards-and-tickets/tickets-for-switzerland/supersaver-tickets.html

Saver Day Pass = 1-day pass valid on all trains and buses (except mountain railways)
Info: https://www.sbb.ch/en/travelcards-and-tickets/tickets-for-switzerland/1-day-travelpass/saver-day-pass.html

Both only sold on the internet. Both the price goes up, and availability goes down, the nearer you get to the date.
The SBB is slowly moving away from the "same price for all trains, all tickets valid on any train" pricing system it has used up to now, and introducing cut-price offers.

The SBB is slowly moving away from the "same price for all trains, all
tickets valid on any train" pricing system it has used up to now, and
introducing cut-price offers.

That sounds like the Saver Day Pass could be gone by the time I travel in mid April of 2020. I also thought it was a relatively new product. I had been counting on it for my trip.

Continental, that is precisely what I meant. The Saver Day Pass is new (-ish, about 1 year old) and part of the move away from fixed-price.

They are moving away from fixed price, same price for all trains at any time of day, precisely by introducing these two new variable price options (Supersaver and Saver Day Pass). Both are variable price, start out cheap and go up in price as you get nearer the date of travel.

Got it. Thanks.

Thank you to all for the insight and clarification!