Li Shenron
Legend
As usual, there's lots of ways for a setting to be low-magic
Personally I think that when we talk about the power of spells, the frequency of spellcasters or what spells exactly exist, it's quite easy to make house rules like Kaodi says: introduce restrictions on levels of spellcaster classes or ban some group of spells. This you can do also in 3e...
2 problems to watch for are DR (if a monster is untouchable by weapons, and you banned spellcasters, maybe better not to put it into an adventure) and spells DC (if spellcasting levels are restricted, offensive spells may be always too weak to work).
The second option for low-magic is the availability of magic items. It's not easy to house rule this in 3ed, but if it's true that in 4ed equipment increases your options rather than you raw power, and that it is not so necessary in battle to hurt the monsters... then it means 4e will certainly make it easier for this type of low-magic.
Also, generally speaking I think it's best to set the standard magic level fairly high (like in 3e), because IMHO house ruling it down is going to be easier than house ruling it up.

Personally I think that when we talk about the power of spells, the frequency of spellcasters or what spells exactly exist, it's quite easy to make house rules like Kaodi says: introduce restrictions on levels of spellcaster classes or ban some group of spells. This you can do also in 3e...
2 problems to watch for are DR (if a monster is untouchable by weapons, and you banned spellcasters, maybe better not to put it into an adventure) and spells DC (if spellcasting levels are restricted, offensive spells may be always too weak to work).
Kaodi said:If multi-classing works as well as they have claimed in 4e, I imagine it would be relatively easy to make an effective and fun character that has only half or less of their level in any one spellcasting class. A cleric/warlord, rogue/wizard or even cleric/wizard if you can allow lots of lower powered abilities.
The second option for low-magic is the availability of magic items. It's not easy to house rule this in 3ed, but if it's true that in 4ed equipment increases your options rather than you raw power, and that it is not so necessary in battle to hurt the monsters... then it means 4e will certainly make it easier for this type of low-magic.
Also, generally speaking I think it's best to set the standard magic level fairly high (like in 3e), because IMHO house ruling it down is going to be easier than house ruling it up.