It comes in a 360GB capacity and in the article below it shows 4 in RAID 0 using ASRock's version of Asus Hyper x16. Completely bootable and an impressive 10k Seq Read. Of course with all RAID 0 you are giving up low queue depth speeds due to latency. But many of us wanted this capability when we bought the x299 and the Hyper x16. It is here.
https://www.tomshardware.com/news/asrock-x299-vroc-optane-905p,37225.html
Panteks Enthoo Elite / Asus x299 Rampage VI Extreme / Intel I9-7900X / Corsair Dominator RGB 3200MHz
MSI GTX 1080 TI / 2x Intel 900p / Samsung 970 Pro 512GB
Samsung 850 PRO 512GB / Western Digital Gold 8TB HD
Corsair AX 1200i / Corsair Platinum K95 / Asus Chakram
Acer XB321HK 4k, IPS, G-sync Monitor / Water Cooled / Asus G571JT Laptop