There's no production cohesion to anything X Japan are doing, from what the most recent released audio suggests (in the background to the European Tour video) Yoshiki hasn't even recorded drums for Born to be Free yet - yet they're already booking more tour dates.
To be honest, I think the more new material the better. The 50% old songs, 50% new songs idea was stupid, especially given that only the vocals of the old songs were being re-recorded. There's like no production cohesion there what-so-ever, imagine Dahlia, which was basically a 1993 - 1996 singles compilation, but instead spread over 20 years. Normally when you release an album the songs fit together, they've been recorded around the same time, mixed by the same engineers, the drums sound the same, the album has a distinct feel to it - just like Blue Blood and Jealousy, and now imagine an album with a song recorded in 2011 next to a song recorded in 1988 with 2011 vocals slapped over it - it's just going to look half assed and sound terrible.