My 1D IV shows up in a few hours... then the charging of the battery. I've already read through the manual.. and have a few set up charts bookmarked. I understand most of it..... though I will have to figure out the back button focus scheme. It's different from my 7D2.. similar but different. I think it's #1 as opposed to zero. It will take me a bit to work through the set up menus.
Unlike my other camera bodies, there are no published books for the ID IV. I guess because the market would be small.
I do look forward to getting past the initial learning curve and getting out there to shoot some photographs.
Congrats, hope you have many years of fun with the Mk IV. It's the first DSLR I've owned that didn't leave me wanting better, even after 5+ years.