Yes, it is 42mm and so I hope we will see many new 42mm 1950 models soon.
It will be necessary to see how they handled this case, especially considering that there were already models like pam1523.
Yes, the hands have to be steel, like the pam1314, and VSF shows its own style: a new model with the right hands is better than the V2 for the 1314.
But I think they will fix it for the 44mm model, otherwise it will be just ridiculous.
This model is not in the panerai catalog, but it has been announced, so, most likely, the next release "by photo".
Apparently, except for the hands, there are no differences in the dial from 1314.
And a good catch about "300m." It is more logical to compare not with pam1392 and with 2392, because it already has a restyled lume and a solid caseback, but in those photos that I saw, the WR is also 100m.