Godox told us that they were going to develop this 3 years ago, and they've finally done it, and leaving aside the question of whether or not TTL is a real benefit to serious photographers or just a marketing feature, we're left with the real question of whether or not the product will (1) work as claimed and (2) be reliable, and my best guess is that there will be teething problems.
So, if you really think that it's worth having TTL, my advice would be to wait, perhaps for a year, to see what happens, because my best guess is that no bricks and mortar business will touch it with the proverbial bargepole, which means that it will have to be bought from one of the many Ebay sellers based in Hong Kong, none of which will honour whatever warranty they claim to provide. In that time, prices may reduce a bit, but not much, because they are already working on tiny margins.