Minor spoiler: Blade of the Ruined King and Wicked Hatchet are actually Season 3 items.
During development, we actually had a very powerful version of Madred's called Tankbusta that completely destroyed the Bruiser meta (yes, it can be done!). However, we found that there was a lot of crossover between Tankbusta and the S3 items, so we scrapped Tankbusta and brought over the S3 items instead.

BotRK is definitely weaker than Tankbusta, but we'll separate them out again and give TT its own replacement if necessary. Also note that this was the plan when we were launching TT. I don't know if they're still going to be on SR as-is, if they're going to get changes, or if they're scrapped from the map altogether.

Does this mean wicked hatchet and Blade of the Ruined King are coming over to SR? If so, are they exactly the same? For example, I'm guessing Blade of the Ruined King would replace MBR---that said, I dunno how 4% of current health (vs max health) would be all that useful--for the first couple of auto-attacks, sure, but a BT will quickly outpace it past that.

I always wonder what was wrong with EC that did WH happen.