Things that will not be in 2007Scape

Bosses
God Wars Dungeon released near the end of August 2007 - after Jagex's August 10th backup
Corporeal Beast
Tormented Demons
Glacors
Revenants
Quests
All quests above and including Path of Glouphrie in the full list of quests
Legacy of Seergaze (+ Branches of Darkmeyer)
Spirit of Summer (+ Summer's End)
Temple at Senntisten
Nomad's Requiem
Most of the Void series (Void Dance onward)
While Guthix Sleeps (+ Ritual of the Mahjarrat)
Smoking Kills
(This includes all grandmaster quests)

Skills and Skilling
Summoning
Dungeoneering
Your current skills
"Grimy" Herbs They will be "unids"
ZMI Altar
Slayer Reward Points
Herblore Habitat, Juju potions, and the Jadinko Lair
Living Rock Caverns
Artisan's Workshop
Bonfires
Kuradel and her dungeon
All 5% bonus xp outfits except for Lumberjack
Dragon Pickaxe
The Toolbelt
Daily challenges

Combat
The Evolution of Combat
High level potions (Super Antifire, Extremes, Overloads, Renewals)
Surge spells
Ancient Curses
Augury and Rigour
Dragon Defender, Platebody, Claws, Boots, Gloves, Gauntlets, Crowsbows, Kiteshield
Corrupt Dragon equipment
Statius, Vesta, Morrigan, and Zuriel equipment
Elite Void, Void Deflector
God Wars equipment
Damage Soaking
Autocasting without a staff, autocasting god spells and Iban Blast
Longer-lasting gravestones
All equipment above level 70, including godswords and chaotics
Food above sharks and manta rays
All nonfood healing methods except for the Guthan's set effect and Blood spells (Soul Split, enhanced Excalibur, Regenerate, Rejuvenate, and bank auto-healing AoE)
A working combat triangle

Minigames
Fist of Guthix
Stealing Creation
Soul Wars
Conquest
Clan Wars
Mobilising Armies

Distractions and Diversions
Fish Flingers
Familiarization
Balthazar Beauregard's Big Top Bonanza
Shattered Heart (aka "Strange Rocks")
Court Cases
Phoenix Lair
Jade Vine

Miscellaneous
The Grand Exchange
All Acheivement Diaries and Task Sets except Easy, Medium, and Hard Karamja
Orb of Oculus no 2007 machinima
No cooldown for Home Teleport will go back to 30 minutes
Max, Completion, and Milestone capes
All rares Not because rares were post-2007, but rather because everyone will start from scratch on 2007scape
Resting and Musicians
Removal of random events

Banks
Tabs
Search
Deposit/Withdraw X
Bank space counter
Left-click Bank instead of Talk
Money pouch
Price checker
In-bank Equip Screen

Game Mechanics
LootShare and CoinShare
RuneScape HD
Item Lending
In-game world selection/hopping
Photo Booth / Forum Avatars No 2007scape a-log pics
DirectX mode This means that certain game recording software such as Fraps will not be able to hook into RS2007
Z-buffering, a major animation technical update that allows animating something outside of its square
Separate clan and friends chats
Any game language other than English
XP tracker and pop-ups
BotNuke and BotWatch (possibly)
Option to turn off profanity filter
Mouse wheel click to rotate camera