Unreal: The Chosen One contains many new features and options. Basically, it is an FPS, RPG elements are included (with a major influence to the gameplay), but still it's FPS. Experience points are given mostly for completing quests (primary & secondary), their amount depends on the importance of the quest completed. Also, experience is increased for eliminating enemies. This also depends on the adversary's rank - the amount of experience points granted for the kills is very small in comparison to quest awards - it helps, when the player needs little experience to gain a level. Another major feature is spell casting. Not the idea itself, which already made an appearance in Nali Chronicles, but the spells themselves and the effects caused by using them (e.g. close-up spell, replacing the sniper scope, works with other weapons also). The story will be presented by numerous engine-powered cutscenes, and of course the immortal LOGs scattered all over the game world.
Updated version, old one can be found here: Moddb.com