The Taurus concealed hammer version isn't an "internal hammer", they just ground down the hammer to make it flush with the frame and DAO. There is still a chance of jamming the gun if it ever needed to be fired from inside a pocket.
I haven't heard about them making a concealed hammer either.
They may figure that's a small niche to fill. I'd rather see a version similar to the Bodyguard, I like the SA capability.