The European ratings body PEGI has entered ‘Metro: Last Light Complete Edition’ into their database. It’s listed as for PC and even says it releases April 1st.
It would seem the original game and all DLC are being packaged. A ‘Metro Redux’ re-release has been confirmed bringing the original games to Xbox One and PS4.
It’s rumoured to be launching for the next-gen consoles in July. There’s no telling when this Complete Edition would surface as Deep Silver is yet to acknowledge it officially.