I have seen this link to the wiki going around the forums a couple times now and we need a disclaimer that the last update on this was 2 years old. It is HIGHLY LIKELY these concepts were already scrapped. Riot has already changed who was working on the project:
Xelnath (RIOT) - about 2 years ago
Alright, I want to thank everyone for their contributions to this thread, but I am locking it for the time being.
After some discussion, I'm handing off the Yorick rework prototype to RiotScruffy (who did a great job on Skarner as you'll see very soon) - and we've reordered the reworks we're doing. Yorick will likely get a larger rework than Xerath, but this means we need substantially more time to do it right.
Thank you for all of your input. :)
Source: The thread where Xelnath (the maker of the rework you linked) was discussing the rework.
Now the real question is whether or not Scruffy is still on the case, because according to ZenonTheStoic he is going to have the most relevant and current info on Yorick.
EDIT:
I did some **_digging _**and found this too. Might be good, but still very subject to change.