I am currently in Chapter 2, have watched someone play up to Chapter 6.
These are the old NPCs I have encountered
Jaheira
Khalid (well, his corpse)
Minsc
Boo
Faldorn
Xzar
Montaron (?)
Viconia
Tiax
Garrick
Biff the Understudy (!)
Xan
I've heard you can find Edwin
Any others? Do they ALL turn up somewhere?
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Sapphire Dragoness of ALSB
Waitress at Cloudy's Cafe
Magess of Lady Lioness' Court
Saint of the SoS
Historian of IW
Most Illustrious Arch-Magess of the Illuminati
Lux omnis est
Once Upon A Paper Writer's Forum