steeldragons
Steeliest of the dragons
Wow. Lotsa good stuff here...I'll second and third (possibly even 4th) a few:
1) Potion miscibility
2) Morale and interactive mod's (with the proposition of a game divided and/or focused on combat/explorative/interactive, separately, I have high hopes we'll see at least some of this again)
3) Intelligent/ego[-maniacal, optional
] weapons or any magic items for that matter. I think the idea of a fighter arguing with his armor or helmet or battle axe is just fun. 
4) Druidic Language and Thieves' Cant (I hadn't realized they'd fallen out of fashion, but I think they're just some good flavorful fun. Alignment lang's, not so much.)
5) CAMBIONS! (good one Stormonu)
6) CASTING TIMES! (I think LOTS of a "wizards is overpowered" arguments would fall by the wayside if thi came back)
I'll add to this...and it'll NEVER happen, but I can dream and the thread asks for last/forogtten tidbits we'd like back, so here goes...
7) DROW ARE BADASS EVIL! Possibly THE most badass evil race to be found...in the Underdark/subterranean realms at least, if not anywhere. Finding/crossing paths...even just SEEING a Drow warrior/priestess/mage should make the party quake in their greaves. "Oh S#!T! The Drow are involved in this?!? We need to get out of here/find reinforcements!"...or, even better, "I see a charcoal grey elf disappear into the shadows? What was that? *URK!*" [slumps over unconscious...if not dead.]
I want all of their innate spell-abilities, special weapons and armor that disintegrates in the sunlight, poisons, and demon-summoning goodness...er..."badness"...brought back [or "out"] with a vengence...as only a race of inherently evil exiled near immortal highly magical elf culture could have.
If I never again have a player say to me "I want to play a drow..." or "I'm half-drow."
or "quarter drow on my father's side...he had this magic panther and bequeathed me his scimitars"...it will be too soon.
Drow as very difficult [read as "for high level parties"] BBEGs, and not available for PCs, would be a lovely returning/reinforced D&Dism, for me.
Again, a Steel Dragon can dream.
--SD
1) Potion miscibility
2) Morale and interactive mod's (with the proposition of a game divided and/or focused on combat/explorative/interactive, separately, I have high hopes we'll see at least some of this again)
3) Intelligent/ego[-maniacal, optional


4) Druidic Language and Thieves' Cant (I hadn't realized they'd fallen out of fashion, but I think they're just some good flavorful fun. Alignment lang's, not so much.)
5) CAMBIONS! (good one Stormonu)
6) CASTING TIMES! (I think LOTS of a "wizards is overpowered" arguments would fall by the wayside if thi came back)
I'll add to this...and it'll NEVER happen, but I can dream and the thread asks for last/forogtten tidbits we'd like back, so here goes...
7) DROW ARE BADASS EVIL! Possibly THE most badass evil race to be found...in the Underdark/subterranean realms at least, if not anywhere. Finding/crossing paths...even just SEEING a Drow warrior/priestess/mage should make the party quake in their greaves. "Oh S#!T! The Drow are involved in this?!? We need to get out of here/find reinforcements!"...or, even better, "I see a charcoal grey elf disappear into the shadows? What was that? *URK!*" [slumps over unconscious...if not dead.]
I want all of their innate spell-abilities, special weapons and armor that disintegrates in the sunlight, poisons, and demon-summoning goodness...er..."badness"...brought back [or "out"] with a vengence...as only a race of inherently evil exiled near immortal highly magical elf culture could have.
If I never again have a player say to me "I want to play a drow..." or "I'm half-drow."

Drow as very difficult [read as "for high level parties"] BBEGs, and not available for PCs, would be a lovely returning/reinforced D&Dism, for me.
Again, a Steel Dragon can dream.
--SD