Yes you are right, there is more than just the battery tweak. Though I really hope they have put that in there somewhere!!
I've turned off the multi window thing. Is any body really going to want two things open on the same screen?
I've read about the page buddy thing, but still not sure what it's all about, so it's turned off 
Phone is slower for some reason, to auto rotate.
There were also a few apps which came with the update, none of which I want to keep, but can't seem to uninstall them either. Does anyone know how to uninstall them? PS ....it isn't the usual way that you uninstall an app.
Nice upgrade but one complaint...who nicked the night mode on the camera!!! 
I rhink going from the office app to gmail is about the only time id use it. Si I dont have to keep sjutting n opening to send n reply to a document.
Got the upgrade but had to connect to Kies to get it. Everything went smoothly apart from having to sign in to my email and utility apps. As above, whilst the split screen may be useful in certain situations, it's switched off as I have no need for it normally.
All share cast is something else I have no need of. Can't say I have noticed any battery benefit but I have found that the stand alone app Street View is now integrated into Maps.
