I read somewhere that Misa-Misa committed suicide sometime in 2011, I can't remember the date though...
The Kira supporter at the end is not misa though, but the thing is why did they make it so darn similiar to her...?
I don't think Near would have been able to, but then again he did have it...before the final batttle began...
*stratches head*
I'm not really sure but I think he would have tried it at least, why else did he burn it so fast, but you didn't see anything that he wrote in the Death note but it could have just been at the back of it...