Being a fan of W40K I noticed the similarity immediately. There is no doubt that the design was ripped off.
1) Large over-sized main cannon
2) Small turret mount
3) Three sided weapons pods in same position
4) Over-sized front cannon on right
5) Two-smaller cannons on left
6) Lights on tread mounting in same position
7) Hatch in same position
I think that the best solution would be for Games Workshop to demand that EA change the design, as because the game is still in production there has been no damage as a result of the infringement. EA would fiercely defend its IP and there is no reason that Games Workshop shouldn't do the same. Nobody disputes that tanks all follow a basic design but the similarities here go beyond that, as the Games Workshop designs are all overly-exaggerated and quite distinct.
PS - I actually used to play Necromunda back in the day and built one of the W40K tanks to go with it (not the one here). Thinking about it that must have been over 15yrs ago. Man I feel old.
"The price of freedom is eternal vigilance."