I am going to try some heavy speculation by using some Shadow of Mordor performance data I have handy..
This is my Q9550
@4ghz + GTX 970 @ 1.5Ghz benchmarking video, at a point that there is some action (be careful of my spicy wallpaper if you move the slider-don't let grandma see it xD)
https://youtu.be/deuAytjMtbY?t=320
No need to watch it however. I can tell you what's going on. The game runs at 50-60fps, with 70-80% gpu load. Therefore the run is already cpu limited, even with the cpu at 4GHz. All that a Ultra preset.
I am mentioning the cpu first and will move on to the gpu later. Now the Q9450 runs at 2,66Ghz. Since it retains the 12MB L2 cache, we can do a division of 4 / 2,66=1.50 therefore the cpu I am using in this already cpu limited run, is 50% faster than your Q9450.
As a result, you would be looking at 1/3 less performance. You would already be looking at 33-40fps compared to my 50-60, from the lower cpu clock alone.
Now the 970@1.5Ghz is also around 40% faster than the 1050Ti, however since it was cpu limited in that run there was still a 20% performance left on the table. I am not going to do more calculations, but with some graphics tweaking (lower than Ultra of course), the 1050Ti could even hit 60fps. Your 720p resolution is quite lower than my 1080P, so for the sake of the argument lets consider the gpu part as 1:1 between 970 OC 1080P and 1050Ti 720P.
Now the problem with all that, is that Shadow of War, will leave behind the solitary single player experience of the Shadow of Mordor and will move towards a more large scale battlefront focused gameplay, which will make the game more complex and therefore more demanding in both gpu and cpu power. So taking the above example of 33-40fps of Shadow of Mordor on your system, will mean that the Shadow of War would most certainly go even lower. Dipping below 30fps is a no no for most gamers.
What we can hope for however, is that the Shadow of War will be built on a newer more optimized LithTech engine which should help with overall performance.
Also lowering graphics settings, also helps cpu performance, due to lower draw calls and consequently lower cpu overhead. Especially distance related graphics settings, work miracles on weak cpus.
All in all, I'd say you'd be looking at 30fps with sensible tweaking of the graphics settings.