What are the differences in the 2014 CZ P-07 from the 2013 CZ 75 P-07 Duty that makes the 2014 version a non-75?
I think it's just a simple name change for the P-07. When CZ first introduced the P-07, they though it might help sales/interest if they gave it the ubiquitous CZ 75 name. Now they're letting the P-07 stand on its own, just as they've done with the P-09.
The changes to the P-07 are basically just to bring commonality between the P-07 and P-09 lines. With the new changes, the P-07 is just a compact version of the P-09. It's like how the Glock 19 is just a compact version of the Glock 17. Other than the size, the guns are exactly alike.
The P-09 was introduced after the P-07 and it had some small improvements/changes. Now those changes are making their way to the P-07.
And yes, the sights are metal and they're 3-dot. They don't use the u-notch rear.