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For the 2023 new T Series iron lines, there will be no T400. I would recommend checking out the new T350 if you're looking for max forgiveness and game improvement. As for an iron release in 2024, highly unlikely as Titleist is very consistent on their new release cycle and 2023 is the year when the irons were released; the earliest would be 2025.

They did not introduce a new model with the latest generation of T series but the T400 is still available. I think the demand has just been too low to cover the cost of development and manufacturing of updated models. I would not be surprised if it was phased out but Titleist would not really make a formal announcement, you would just see the offering go away and shelf stock eventually sold out in stores.

I have been waiting and hoping that they will bring a second generation out soon. There was a release in the Japan market so I thought we would see one, too. No word that I've seen if or when it may happen. Still using the first edition T400 and can't find anything I like better.

It is a Japan only model…for now.

Haven’t heard what is in store for the US Market. There is an upgrade V.2 T400 in the Japanese market. My guess there will be an announcement at the PGA show in January. I would think the current version will be discontinued. But like forged wedges, the T400 may only be a Japanese product.
I’ve had the T400 and the Gen 3 T350 is a remarkable GI iron. There may be too much overlap to continue the T400.

As stated above, the Gen 2 T400's are manufactured in Japan only. I just picked up a set from Tour Spec Golf and, while are enormous like the Gen 1 irons, the feel and sound are much better.