I might get to put my beloved DK back to mag spec and feel useful again in trials.

OP, I assume and it seems that everyone else is also assuming that when you said "'patch" you meant "update". Performance improvement is always at the top of my list, so multi-core support is gonna be great, but as far as the content, the one thing that I could get more than a little interested in would be jewelry crafting. Although I'm sure it'll be cool, the Summerset Isles, will be just another map that I'll eventually get to. Being a subber I have access to all DLC's but I'm still working through most of the content on most of the others, so it'll be even longer before I do Summerset's. A new character slot would also be cool to have in reserve, but I know myself, and after a week with the slot just sitting there, not researching and not doing any stable training and not leveling, I know I'd make another alt, then no more reserve.