Bandai is releasing the S.H. MonsterArts Gigan Great Battle Version figure. This figure will be available for pre-order April 23rd for 15,180 yen with release scheduled for Sept 2021. The price and image released so far suggest this figure will include a bunch of extras, both parts for the regular version and the chainsaw hands version, beam effect, and more. We will update with full info once available.
Update: this figure includes 4 chain parts, cluster effect with stand, and replacement part for regular and chain saw versions, and it stands 18cm tall. Pre-order is now up on the Bandai Premium website.