New Features:

Hot Seat Play
Play By Email
Hotseat/PBEM Interface Screen
Scenario Pack Interface (description, test plan)
New Scenario Options
New suite of build queue messages
Turns-to-next-pop display on City Screen instead of a food readout
Trade routes can be toggled on and off
Message Eyepoints can be activated from the keyboard
Message indicating what city slaves were sent to after successful enslavement was added
Tile Improvement placement precision increased

Bug Fixes:

Graphics freeze from double-clicking an advance to research
Trading with AI Bug Fixed
Captured cities get selected
Fixed eyepoint click centering AND selecting the city in some messages
Fixed CD-check requirement that each player have a CD in multiplayer saved games
Fixed hardcoded "Reset Trade Route" string
AI stop-trespassing behavior is improved
Boats/Undersea Tunnels pathing problem fixed
Can continue play when someone wins the alien endgame
Autocentering on special attacks now happens correctly
Chat window scrolling bug fixed