I think you're title explains it well enough that spoilers are pretty much a given in this thread. Nothing too exciting here, it's been awhile since I read the last one and although I probably know the first 5 back to front it's all a bit hazy after that.
Mat will enter the Tower of Ghenjei again and beat the Elfinn by changing the rules aka the snakes and foxes game.
Loial will lead the Ogier to war in the final battle and afterwards the ways will reopen with the Ogier will becoming it's caretakers.
The Aiel and the Tinkers make up, ending the Tinkers quest for the song and the Aiel's guilt.
Logain will become the new leader of the Black Tower.
The Dark Ones prison has to be remade not patched, ready to be completely forgotten and start all over again.
The combination of the resergance of both saidin and saidar and Rand's efforts to promote invention/engineering will begin the progress towards the next age of legends.
and Berlain and Galad end up together and have extremely good looking children
.