I was wondering, would Gnolls make a good subrace? They're fairly uncomplicated. All one has to do is apply an extra +2 Str and Con to a half-orc. There's the +1 Natural armor, but you could do the thing you do with Kobolds. Like in the Monster Manual, their ECL would be +1.

Would likely by very low priority, and there'd be heavy complications in playing a Gnoll, in my opinion.

Kobolds, Goblins, etc are tolerated due to their fairly harmless nature when not in a part of a big tribe. They usually take up places as lackies and suchlike.

Ogres, Minotaurs, etc are big enough to intimidate people into not hurting them (and often fit into society as bouncers and guards).

Gnolls, Orcs, Drow, etc are both dangerous but singularly not strong enough to look after themselves. They also don't serve any really exploitable purposes in society, as far as I can tell. They've got all of the stigma associated with monster races and none of the positives.

I wouldn't anticipate very long lives for Gnolls, Orcs, Drow, etc.

Can be done, but I think that we're going to wait to actually add it until we get a suitable application.