Just announced for current gen and PChttp://www.joystiq.com/2014/05/22/metro-redux-remasters-moscow-for-ps4-xbox-one-and-pc/
Expect the mechanical improvements of LL to make their way to 2033, plus the ability to play either game in the style of the other. Not sure how that will pan out.
Metro Redux presents both games at 1080p resolution and 60 frames per second. Redux versions of Metro 2033 will be available for download separately for $24.99 each, or as a combined retail package on PlayStation 4 and Xbox One for $49.99.
Launch window is late summer.