Hi! My First Post here. 
I'm looking on some advice. I have the old d&d4 core books, and I'm not sure what the "current state" of d&d4 is.
I used to play AD&D2, a few of it's clones, D&D3 and some other "old" games, like Call of Cuthullu, Pendragon, Warhammer RPG etc. But I haven't played P&P RPG's for almost 10 years now.
I have decided that in the next half year or so, I would like to cut back on my PC use (reading online articles, forum trolling, playing games, youtube-ing, watching movies etc.) but instead write down some RPG material I have in my head on paper.
I wanted to do something like this for years now, and I hope my recent job changes will allow me to do just that.
I have been reading rpg materials, going through reviews, watching forums etc, and I've decided to "number crunch" my thoughts in D&D4 (which at first look I like very much), but if I understand it correctly, D&D4 had some recent changes. So I would like to ask some questions, before I embark on my journey to scribble some nonsense onto paper.
01. Is it true that the core 3 books (PHB, DMG and MM1-2) are kinda outdated and the online erratas aren't updated any more?
02. Is it true that the MM3 has a new format that changes monster stats significantly? Making MM 1&2 outdated? (Making MM3 D&D4.1?)
03. Is it true that the new essential books outdate the old core books? Making it D&D4.5 basically?
Lastly:
04. I have the old d&d4 core books (not the deluxe edition or the essentials), if I'd like to publish (online, in a blog or something) my ideas, would my "work" be usable by someone with MM3 (4.1) or the essentials (4.5)?

I'm looking on some advice. I have the old d&d4 core books, and I'm not sure what the "current state" of d&d4 is.
I used to play AD&D2, a few of it's clones, D&D3 and some other "old" games, like Call of Cuthullu, Pendragon, Warhammer RPG etc. But I haven't played P&P RPG's for almost 10 years now.
I have decided that in the next half year or so, I would like to cut back on my PC use (reading online articles, forum trolling, playing games, youtube-ing, watching movies etc.) but instead write down some RPG material I have in my head on paper.
I wanted to do something like this for years now, and I hope my recent job changes will allow me to do just that.
I have been reading rpg materials, going through reviews, watching forums etc, and I've decided to "number crunch" my thoughts in D&D4 (which at first look I like very much), but if I understand it correctly, D&D4 had some recent changes. So I would like to ask some questions, before I embark on my journey to scribble some nonsense onto paper.

01. Is it true that the core 3 books (PHB, DMG and MM1-2) are kinda outdated and the online erratas aren't updated any more?
02. Is it true that the MM3 has a new format that changes monster stats significantly? Making MM 1&2 outdated? (Making MM3 D&D4.1?)
03. Is it true that the new essential books outdate the old core books? Making it D&D4.5 basically?
Lastly:
04. I have the old d&d4 core books (not the deluxe edition or the essentials), if I'd like to publish (online, in a blog or something) my ideas, would my "work" be usable by someone with MM3 (4.1) or the essentials (4.5)?
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