I don't know if you care about from the addon/combatlog/tooltip point of view, but here are some 4.0.1 shaman bugs.
1) SPELL_AURA_BROKEN and SPELL_AURA_BROKEN_SPELL events do not work for Hex. These events seem to work for every CC in the game except for Hex, they do work for Bind Elemental. Shaman using Hex are the only CC where you can't have an addon easily tell you what broke it.
Edit: Other CC worked prior to 4.0 except Hex. Since 4.0 apparently lots of CC do not work with these events.
World of Warcraft - English (NA) Forums -> [BUG] Combat log SPELL_AURA_BROKEN[_SPELL]
2) Lava Surge! does not fire UNIT_SPELLCAST_SUCCEEDED or UNIT_SPELLCAST_SENT events. It does log to the combatlog as a SPELL_CAST_SUCCEEDED, so an addon can monitor the combatlog to detect it, but most spell alert addons will not work for Lava Surge.
World of Warcraft - English (NA) Forums -> [BUG] Lava Surge no event fired
Tooltip bug:
3) Glyph of Earthliving changes the Earthliving tooltip to say that it has a 40% chance to proc (in addition to showing an increase to the amount), however from my testing the proc chance is unaffected.
It might also be worth noting undocumented shaman bugs that were fixed in 4.0:
a) Riptide hot not applying when spellpower decreases seems to be fixed from my testing.
b) Shaman hots scale with haste.
c) Wind Shear and Windfury Weapon now have different icons.