AurelianDragon: TBH, as I just alluded to in another thread (should've read this first ...), I'm not really sure there's as much room for addition in this game as there was in the Baldur's Gate and Icewind Dale games, so I'm not surprised Beamdog is sticking to modernising the engine in this case.
BG1/2 and IWD were far more open in terms of the nature of the world, and moreover, almost every area can be returned to. I am pretty sure Candlekeep in BG1 and Brynnlaw/Spellhold/Sahuagin City in BG2 are about the only ones you can never go back to once finished - not counting of course the SOA zones once you move on to SOA final endgame/TOB - and in IWD the only places that become non returnable before the final point of no return are Easthaven and the expansion zones. Thus, additional content, including new characters, could be sprinkled into the game and dovetail fairly easily with the existing content.
Not so much PS:T; there are a lot of places you can't go back to once you're done (the whole section after you leave the Clerk's Ward into a certain major character's maze until you come back to Sigil is not only non returnable, but each individual place is pretty much a one shot trip). This flow makes it much harder to insert additional content into and have it work well; in addition, there is a lot less latitude for additional characters - the "core party" in PS:T pretty much implies taking Morte, Annah, Grace, and Dak'kon, leaving you space for ONE character - and we already have the issue that both Nordom and Vhailor are located in areas that you can't return to after acquiring them and leaving the area, i.e., if you had a 6th character in either case, someone pretty much has to be lost forever. This also means that some ideas one could think of probably wouldn't work well either (e.g., Deionarra's ghost as a party member? Given the connection between her and the PC, one could think of it; but that would basically expand the core group to 6, meaning basically every "optional" character is now pretty much iced)
Also, to those who pooh-pooh. This EE is sorely needed. On Win8.x and 10, it is becoming increasingly difficult to run the game happily, with the screen flickering issue being more or less unavoidable ... atm, you pretty much have to run PS:T on Linux to make it play nicely, something I'm actually noticing is a thing with a fair number of older games: Windows version on Wine (which includes PS:T, as it uses a Wine wrapper rather than native Linux code) actually running better than either native Windows or, ironically, even native Linux (which seem to be running into issues lately due to the monstrous horror that is the evolution of the C++ ABI)
(BTW, PLEASE tell me they've finally added the "press this key to see usable objects/containers in view" button? Please?)
I have had zero problems running Planescape on Windows 10. Perfectly playable and at high res too.