5E may change this, but in most older editions, magic items favor the noncaster. They allow access to abilities that are otherwise reserved for casters, and things like +1 weapons boost the stats of classes who rely heavily on "high numbers" (attack bonus, damage rolls, hit points, skill bonuses) to do their thing*.
As for monsters, that will indeed make a difference. Mostly it's a question of how monster saves compare to monster AC/hit points. Monsters with good saves and poor AC/hit points favor the fighter; monsters with good AC/hit points and bad saves favor the wizard, and to a lesser extent the cleric. We have a few data points, but not enough yet to judge the whole.
Why do you expect to see more spells added to Basic, but not more class options?
[SIZE=-2]*If you think high-level 3E was a caster's paradise with magic items, try it without! The wizard loses a couple spells per day and has a few points knocked off her save DCs; annoying but tolerable. Without the full Christmas tree of magic weapons, armor, and stat boosters, the fighter deflates like a popped balloon. "Wizard's lackey and pack mule" becomes "wizard's Chia pet."[/SIZE]
3.X was the exception, it is true. The changes to item creation, item costing and fungibility, skewed magic item acquisition and reliance away from non-casters and provided a strong table focus on acquiring the "big 6". I remember the point when that snapped into focus in my first 3.X campaign. The player found a very powerful, very useful magic item (Mirror of Mental Prowess) ... and promptly went to town and sold it, split the cash, and went shopping "for the things they needed". Well, the non-casters went shopping. The casters decided to hunker down for a month or so and simply build items.
The cost of non-combat abilities was insanely high in a relative sense (because of the geometric nature of magic item costing) in 3.X as well.
I expect more spells to be added to the standard game -- not to Basic. I figure that section of Basic is baked and done save for "living system" changes.
I expect the player will be presented with more options during character design in standard, but if the player chooses human fighter (champion) it'll look like the Basic version and if the player chooses high-elf wizard(evoker) it'll look like the Basic version. The difference come in where the evoker then gets to pick spells from B+S spells in standard versus B spells in Basic.
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