...these will be getting an offical Bluray boxset remastered.

Maybe in the UK and other territories, but not in the US. Mad Max in Region A is owned by MGM/Fox, while The Road Warrior and Beyond Thunderdome are Warner properties.

I have a feeling Warner is prepping a BD double-feature for movies 2 and 3 (since Road Warrior is now OOP in the States). But, given how MGM's catalog is generally treated like leftovers by Fox, I wouldn't expect a real reissue of Mad Max anytime soon...save one of those "digibooks" Fox is so fond of :/