That 10 TB version has been named the Nytro XP7200 and is scheduled for mass production in Q4. Based on four Nytro XM1440 M.2 SSDs under one heatsink on a full height expansion card. It will be headed for enterprises because it is still going to be rather pricey.
But the second drive is a little more interesting. The unnamed SAS SSD has 60TB of 3D TLC into a 3.5" drive.
This means connect a thousand dies of Micron's 3D TLC NAND to a single SSD controller. It aslo uses , ONFi bridge chips to multiplex the controller's NAND channels.
Speedwise it is not that great. It has a read speed of 1500 MB/s and a write of 1000 MB/s. But with 60 TB of storage who can complain?
Seagate say that the 60TB SSD is only a demo at the moment and won't be appearing as a product until next year. We think that it will cost thousands but at least for a moment Seagate will have the record.