Here additional Info to the Enhanced Version from Beamdog Forum:

In addition, here are some design decisions that we made (Alex Tomovic is the PST:EE Project Lead):
No new party members, quests, NPCs, areas or cinematic movies
No new writing by anyone except Chris Avellone. In case you're wondering, Chris wrote a couple of new journal entries, adjusted a few special ability (i.e. Morte's Skull Mob) textual descriptions and composed the text that is displayed on the new "Welcome Screen". He also designed the Steam Achievements (wrote the text and specified the icon appearance) and named the new main menu buttons (i.e. Options = Alter Senses)
No changes to existing writing except for a proofreading pass of the original game text by Chris Avellone (he asked to do this)
No kits/classes/races/spells/items from BG2 or IWD
No changes to the combat and general gameplay
No "Story Mode" or "Heart of Fury" difficulty settings
No multiplayer
Note that when we say "writing" we're referring to the text that the player can access within the gameworld i.e. by talking to NPCs, inspecting objects, spells, items and the journal. That doesn't include text that is accessed outside of the gameworld such as the technical descriptions which explain how new UI options like "Zoom Lock" or "Hardware Mouse Cursor" function. The descriptions of those options were written by the developers who worked on implementing them, not by Chris Avellone.

Soundtrack.

We had access to the original, uncompressed versions of the music tracks which were then used for the remastering process.

Mark Morgan wasn't involved directly.

Outlines and sprites.

And for people asking about the black outlines and blurry sprites, here's a pixel perfect 1080p screenshot with most of the EE options turned off.

http://planescape.com/img/screenshots/desktop/03.png

That should be the closest to the original game + widescreen mod.

Portraits.

We didn't have access to the source art for the original animated portraits and movies.

Without the source art, the only way to update the EE versions would be to re-create the movies and portraits from scratch and we felt that doing that would alter the feel of the original game too much.

Combat AI.

The combat and general gameplay of the original game were left unchanged for PST:EE.

Altering those within the base game (without making it optional) didn't feel right to us.

PST Fixpack.

For people asking about the integration of the PST Fixpack: we contacted Qwinn in the early development stages of PST:EE and obtained permission to use it. During development, the fixpack has undergone a thorough review by the PST:EE team and Chris Avellone was consulted whenever there was uncertainty. As a result, all objective bugfixes have been integrated into PST:EE.

Note that some of the more subjective fixpack changes have been deliberately left out for PST:EE because they contradicted the original (Black Isle) developer intent. This is not Qwinn's fault, as he didn't have access to the original PST design documents (which we do) nor to the PST source code (which we also have) so he had no way of knowing. As an example, PST:EE leaves out the fixpack change that gave enemies the ability to run towards the player while engaged in combat. The original design documents and the source code both confirm that enemies were deliberately prevented from running in that situation.

Unfinished Business.

We obtained permission to use the Unfinished Business mod, but decided not to after some internal discussions.

If/when the mod is updated for PST:EE people will still be able to install it, if they are so inclined.




Which mods, or parts of mods, for PST are included in PST:EE?

Qwinn's PST Fixpack has undergone a thorough review by the PST:EE development team. With Qwinn's permission, we've integrated most of the content from that mod into PST:EE. Other changes were left out as some of them had been cut from the original game on purpose.

And an addition.

PST:EE is the canonical version of the game in terms of the content.

We've been working with Chris Avellone on it, and his stance is that some of the content that was cut from Planescape: Torment was cut for a reason, so we didn't want to include Unfinished Business since it wouldn't be the canonical version of the game.