1 You need some scriptwriters & director with enough depth to handle a very well-written & complex character.  Since that isn't going to happen, it's going to be terrible.
Most especially since the nature of the entire story is "what is Human?", which I doubt most in Hollywood can handle, since they barely qualify themselves.
If the screenwriters have any wisdom, they'll use one of the Stand Alone Complex episodes that was set in Germany.  It would give them a lot to work with, without having to stretch anyone too far.

2 There's been threats rumors about a GitS movie for years... this is the first time I've ever seen a name attached to it, though.  I am now officially scared.

3

Mamoru Oshii, who (Fortunately.) had little to do with the GitS franchise outside the movie, did have a certain Polish actress in mind for the role of the Major in a live-action movie IIRC.  I do think Hollywood would be doing a great service to the world if they kept Oshii from getting his hands on any part of a live-action movie, since it would result in a nearly constant monologue that would turn into idiotic idealism (Patlabor 2, I am looking at you.).

There has been rumblings about a GitS live-action movie for years now.  Sometimes more and sometimes less serious.  Not sure what this news would qualify as, though.

It is a good thing for Scarlett Johansson to have said to be attached to the project, since her stock has been steadily rising with her participation in the Marvel movies.

4 Noooooooooooope.  Can't see that working, although again, more because I just don't think Hollywood would even address the background or story.  Or characters.  I imagine it starts and ends with "Like Terminator, except it's a girl.  A hot girl, of course.  Scarlett Johansson would be good.  She shoots things, assassinates people, blows up computers and can go invisible."
Also, I like Patlabor 2!  All three Patlabor movies, for their faults, do a great job telling stories with background imagery, setting, atmosphere and music.

5 Not to mention that the GitS show(s) tend to dwell upon bureaucratic infighting within the Japanese security forces/government.

Of course, in GitS, "bureaucratic infighting" can result in blood being spilled so maybe that's not all bad.

6 Hmm, should have added this:

I'm sure that Hollywood will do the same bang-up job that it did with "Starship Troopers".