arround 1 year ago dominik told about that

https://bitcoinblog.de/2016/07/13/iota-die-kryptowaehrung-fuer-maschinen-eine-blockchain-ohne-bloecke/

its on german there is a sentence where he said

"Geht es nach Dominik, soll IOTA zum zentralen, aber nicht einzigen Protokoll für Maschinen werden. “Wir planen, dass IOTA auch mit Ethereum und Bitcoin-Schichten wie Rootstock kompatibel ist. Daran arbeiten wir aber gerade noch.”"

in english ( sorry not perfect maybe )

if, after dominik IOTA should be central but not the only protocol for mashines be. we plan that IOTA with Ethereum and Bitcoin layers like ROOTSTOCK will be compatible. on this we are working

this sentence is arround 11 month ago and now there is first anouncements that they are partnered Nice GO moon iota