Buna vladmihai, I'm the writer who worked on Warwick. Here's what I would say...
There's a certain way of looking at Warwick's backstory where it's already complete. I.e., the goal was to make memory loss a part of his story, and not a hole in it! It defines who he is and where he might be going. The stories we can tell. He wouldn't be Warwick if he knew everything.
But his memories are definitely (gradually) coming back, so there's room to learn more about his past... in the future. [slayer-pantheon-thumbs]
In the meantime, at least Necrit showed us what would happen if Warwick and Ekko got into a fight. :D https://youtu.be/exALR-TvwSc?t=31s