So far I've only seen pictures of few clothing items, & videos with finished customized characters. But no media of the customization in motion itself? Why?... Or maybe it's just a matter of time until we see it. Can't wait.
This is not an official artwork made by Harada's team. It's made by a fan nicknamed Diepod as a reply to Harada trolling about not including Lucky Chloe to regions outside of Asia due to the backlash on her design.
I found it in a list of unused concepts for Tekken games on wikipedia.org. He was described as;
"A concept image of Luke has traveled around the Internet. However, it is unknown whether it is from a fan or whether he will be a new character for Tekken 7. Luke is hard to find. Respectively you can probably find them no more."
Since it's so rare, it's no wonder you don't know him.
Honestly, you could be reprimanded for posting someone else's fanart without permission. But can I blame you? You weren't aware that it's just a fanart (by Diepod).
But next time, if you aren't sure that something is a fanart and not official; please make use of Google Image's search by image feature. It will always point you to the original source.
About what you said here = "Since it's so rare, it's no wonder you don't know him. "
Anyone can edit a Wikipedia article and make claims about any characters. I certainly do not like being criticized by my "lack of knowledge" towards...substandard background stories created by fans that are desperately made to look like the real thing.
Yes, if you ask me, that whole Luke thing sounds utterly stupid. A lot more stupid than that Mary Sue Filipina character (named X.D.) created by some Sonichu-wannabe desperado that got banned here within less than 24 hours
At this day and age, only HARADA-TEKKEN's twitter can be trusted for verifiable information.
The Luke thing occurred when Wonkey accidentally posted a photo of a concept art from another series, and mistakenly thought that it was a Tekken character. He took out the article as soon as he realized he was wrong.