I'll be using mostly level 100 chars with 680+ gear from the Invasion Drops. The 100s are a Paladin (Ret Spec), Warlock (Demo), Priest (Holy) and DK (Frost Spec).
...I plan to solo Outland, Northrend, Cata and possibly some Pandaria Raids and Heroic Dungeons. The only fights I know of that can't be soloed due to mechanics are Emerald Dragon in ICC for non-Healer classes (So my DK and Lock Can't do it alone) and Spine of Deathwing (can't remember why). There's also that skippable boss in BT that requires another player to unpin you.
I can't remember if Flame Leviathan is soloable or not though I remember getting past him twice before with my Pally. Same with Yoggy. Any other fights that I will definitely require another person (which I can get) to get past from old content?
I also plan to try some older raids/dungeons with 90 chars at at later time if that matters. I've soloed Heroic LK 10 unbuffed with my Pally a few times so I know the insta-death mechanic at the end was removed.
Any help in this would be greatly appreciated ^_^