CRA has info page now - 

https://www.canada.ca/en/department-finance/news/2022/03/climate-action-incentive-payment-amounts-fo...

Also Intuit Profile includes 'estimate' calculation at the bottom of the T1Summary

I agree this is upsetting with people owing $200-$300 - mostly lower income people that could do with a small refund instead of waiting to get it back over the next year.