Well, as a player who wants reloading, BGS hasn't given us any indication of whether it is included as a mechanic in FO4. We haven't even seen if they've included ammo types as of yet.
FO3's system was an overly-simplified inventory giving us such jewels as "shotgun shells." New Vegas mercifully gave us a useful ammo reloading system (that players who didn't want to be bothered could actually ignore completely), and realistic types that were properly statted, that made a real difference the higher you went up in difficulty. It was a tremendous advantage on hardcoe where ammo had weight and you could carry less, more powerful ammunition.
If they went back to the FO3 ammo system, because it's "too hard", "not necessary", or "distracting," it'll a big step back for those of us who actually use, and find value, in a functional reloading system; if they actually improved upon Obsidian's mechanic, it'll be a step forward...which I always expect out of BGS.
Right now, it's been dead silence. We'll see.