Since "Burden of Knowledge" isn't an anti-pattern anymore (AFAIK), will there be an Invoker-type?

Anybody who's played DotA Allstars remembers Invoker's levels of complexity. He had several different spell combinations depending on what rune combinations you were using, leaving him with tools for virtually any situation, but making him one of the hardest heroes to master.

Riot has said in the distant past that an Invoker would be toxic design for League, but considering the complexity of some of their more recent releases and remakes (i.e. Ryze), have they repealed their thoughts on an Invoker? Would an Invoker be viable for League?

This is not to say I necessarily want an Invoker (he was always a paininmyass during my DotA noob days), but I'm just putting this up for discussion.