The first real details on the Powerhouse hit Facebook this morning:
https://www.facebook.com/Anker.fans/...03837939695608
$499 ($399 with a promo code), 434 watt-hours inside there. A standard FRC battery is 216 nominal, so you've got a hair over two robot batteries of power available. But you couldn't get two charges out of that, due to efficiency losses in the inverter and then the battery charger.
Still a cool piece of kit, but if I was spending team money I'd probably stick with the inverter and retired battery system unless there was an overriding reason.