A listing from Action Robo on Facebook has a simple set of details but they are all crucial, here is what is stated:
MP-44 Optimus Prime ver. 3.0
Late August 2019
50,000 Yen
Firstly, we now know the numbering of the figure, MP-44, and that it will be coming out in august next year. Also, while the 50,000 price point (seems high, it fits in line with the increase in prices in the MP line. We had a similar reaction when MP-41 Dinobot was revealed to be 28,000 Yen. MP Beast Wars Megatron was revealed to be even more expensive than that, and with Optimus Prime coming with a massive trailer, this is the around the price point we were gearing up to get. Of course, this is the MSRP and while domestic importers may stick with this price, the figure may be up to 30% cheaper if you deal with the importing yourself.
Just to give an idea of the current exchange rate, 50,000 Yen is equivalent to:
$440 USD
$585 CAD
$610 AUD
390 Euros
345 Pounds

