As seen in Chapter 3 of the Mandalorian (The Sin), the Heavy Infantry Mandalorian will be a deluxe release in the Star Wars Black Series.
He has been listed as a Bestbuy exclusive in the US and appears to be available now for US collectors with immediate shipping. We await details of a UK / worldwide release.
"Make smooth gunfighter moves with this Star Wars: The Black Series Heavy Infantry Mandalorian deluxe action figure. The armored bounty hunter has four articulated limbs for creating fearsome fighting poses, and the premium detailing inspired by the Disney+ live-action TV series satisfies collectors. This Star Wars: The Black Series Heavy Infantry Mandalorian deluxe action figure comes with an accessory for dynamic play."