It appears the duo Donatan & Cleo with have been selected internally for Eurovision - according to sources close to TVP, the national Polish broadcaster. The song they take to Copenhagen would be Slavic Girls! It's brilliant! The English version was actually released this morning..
The original version, in Polish, has clocked over 37 million and is already a domestic hit over in Poland. No confirmation from TVP yet but hopefully they'll confirm this soon, fingers crossed! The BBC also did an article on the song in November, when it was released. I'm already reading "Warsaw 2015"- let's just hope TVP confirm soon.