Ticker will be SGVT. It looks like it'll follow US treasuries and some other government securities. I know we won't know the rates, yields, etc till it comes out but seems like it could be a good place for savings (an alt to HYSAs).
"Schwab's exchange-traded fund will have a fluctuating NAV based on market values, representing a different approach in the money market ETF category where investors increasingly seek cash management options with the convenience of exchange trading."
"the fund will invest in U.S. government securities such as Treasury bills, notes and obligations issued by government agencies. At least 99.5% of the fund's assets will be in cash, government securities and/or fully collateralized repurchase agreements."
https://www.etf.com/sections/etf-watch/schwab-files-new-government-money-market-etf