The new series' first issue, with cover art by Tigh Walker, appears available to order:
https://shop.boom-studios.com/comics/detail/10787/
(I haven't ordered it myself, so I can't personally confirm if it's shipping immediately.)
The version with cover art by W Scott Forbes is currently "unavailable" at the time of this reply. (If it will be released, I wonder why pre-ordering is currently disallowed? Check back later, or contact the shop if you want to inquire about it.)
https://shop.boom-studios.com/comics/detail/10786/
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Pre-ordering is now available for issue #2; it is expected to ship "after" January 6th.
Issue #2 with W Scott Forbes cover art, pre-order:
https://shop.boom-studios.com/comics/detail/10905/
Issue #2 with Tigh Walker cover art, pre-order: