The backbone of the system would be 3e, while incorporating some of the better ideas from other publishers. They should especially take a long look at what the folks over at Mongoose did for the Conan RPG.
Bring back the limitations on wizards, ala 2e. Casters will always be more powerful than warriors, but removing the only reasons to not play a caster makes warriors worthless. Bring back casting time and memorization time. Knowing that if you cast that ninth level spell your enemies have 9 segments to go after you and try to disrupt your magic AND knowing that it takes an hour and a half to re-memorize that spell makes you think twice. A high level 2e wizard simply couldn't replace all his spells in one day, he had to be more selective with casting.
Remove all rules that require a battlemat. I don't like battlemats, and I don't like being forced to use it as a dm. If I'm a player, that's fine because it's my DM's game and his rules. If I'm a dm I should be able to do without it. Cinematic combat > tactical combat, that's why novels don't provide detailed maps of the battles that take place.
Bring back specialty priests, 1e/3e/and 4e priesthoods are all too similar. Also make a non-fighting cleric class. Clerics are great at killing things, they suck at doing things priests should be good at. You know, influencing reactions, tending the flock, providing knowledge, etc.
Enhance the idea of level tiers. I love the E6 rules and prefer playing at that tier above all others. Providing rules for stopping level advancement at the level of the DMs choosing allows him to create the atmosphere he desires. Not everybody like plane-hopping supermen!
Bring back the limitations on wizards, ala 2e. Casters will always be more powerful than warriors, but removing the only reasons to not play a caster makes warriors worthless. Bring back casting time and memorization time. Knowing that if you cast that ninth level spell your enemies have 9 segments to go after you and try to disrupt your magic AND knowing that it takes an hour and a half to re-memorize that spell makes you think twice. A high level 2e wizard simply couldn't replace all his spells in one day, he had to be more selective with casting.
Remove all rules that require a battlemat. I don't like battlemats, and I don't like being forced to use it as a dm. If I'm a player, that's fine because it's my DM's game and his rules. If I'm a dm I should be able to do without it. Cinematic combat > tactical combat, that's why novels don't provide detailed maps of the battles that take place.
Bring back specialty priests, 1e/3e/and 4e priesthoods are all too similar. Also make a non-fighting cleric class. Clerics are great at killing things, they suck at doing things priests should be good at. You know, influencing reactions, tending the flock, providing knowledge, etc.
Enhance the idea of level tiers. I love the E6 rules and prefer playing at that tier above all others. Providing rules for stopping level advancement at the level of the DMs choosing allows him to create the atmosphere he desires. Not everybody like plane-hopping supermen!