No Gnome players in OD&D or Basic set if I recall correctly. So they must have been monsters.
Not base in the 4E PH. The list for 4E PH is: dragonborn, dwarf, eladrin, elf, half-elf, halfling, human, and tiefling. PH2 adds deva, gnome, goliath, half-orc, and shifter.Here I thought gnomes had always been a PC race in D&D...hmmm, I guess I just figured they were a base race in 4E.
When I rolled up my minotaur, Sharm, for his brief sojourn in Atanatotatos's 4E Playtest, I'm pretty sure that his maul was medium-sized, but I'm not absolutely certain of that.ALthough they do add the caution that the monstrous PC's aren't fully playtested as PC races (which is probably why they are all able to wield over-sized weapons, while the base races can't)

(Dungeons & Dragons)
Rulebook featuring "high magic" options, including a host of new spells.