According to this forum thread at the Neverwinter Nights main site, there will probably not be any video playback for the Linux client. The original movies use the Bink codec, and tell critical parts of the campaign story between chapters. The 13 – 14 December 2002 updates to the Linux client news page had led many to believe that Bink had been a significant stumbling block in the client release and that the issue had been resolved. A post in the forum thread seems to indicate that no Bink Linux support exists, and that the original optimistic post was predicated upon erroneous information.
Interestingly, the solution proposed by a forum moderator is to use WINE and the Windows Bink player.
Saw this on Slashdot’s games section and figured it’d make for some healthy discussion here.