I have mixed feelings about this. Most of the changes and additions sound pretty good. However, if the D-scanners' ability to give you the system map goes away - the above does imply that, no? - then it'll be much more time-consuming to find the valuable and interesting planets than it is today. Or will we still be able to see the system map at a glance as it currently is, and will just have to use the new gameplay to pinpoint, further interrogate and map the bodies?
Also, about the probes and first mapping: will we be able to map bodies which we can't (yet) land on, or will they be on landables only?
To put it another way, let's see an example. Right now, I jump into a system, fire my ADS and look at the system map while scooping fuel. I can see at a glance what kind of bodies there are in the system, and can fly close to them if I wish.
Now, in the new system, will I still be able to call up the "old" system map, or will I have to spend much more time to find out what bodies there might be in the system?
After all, let's not forget that many systems only contain lots of uniform, uninteresting bodies.
Other than this, it all sounds pretty good. The "first mapped by" is a nice touch, too. Oh, and please include the first discoverer and first mapper(?) information in the journal files!