The Aichi Prefecture government announced that the theme park's approximate cost is 34 billion yen (31 billion for construction of all five areas and 3 billion for design and planning). It is estimated that there will be approximately 1.8 million visitors a year once all five areas are opened.
Newly released concept art:
Sources: https://www.asahi.com/articles/ASN246W20N24OIPE023.html and https://www.nikkei.com/article/DGXMZO55242800U0A200C2L91000/ and https://www.pref.aichi.jp/uploaded/life/271598_953576_misc.pdf