Guild Wars Nightfall

Campaign Three (a.k.a. Chapter Three) is an upcoming stand-alone product ("Campaign") of the Guild Wars game series, a follow-up of Guild Wars Factions (Campaign Two).

No title has been announced so far.

Content
Not much is known about a theme or new content so far.

Campaign Three is supposed to feature North African/Middle Eastern settings; two new classes.

Release Date
No release date has been officially announced yet.

However, ANet hinted at the release date with two statements:
 * According to Jeff Strain Campaign III has been in development since Nov 2005 (source) and the development time for each campaign is roughly 1 year.
 * ANet have stated that they plan to release two campaigns per year, released on staggered six month cycles. Factions (campaign 2) was released April 28, 2006.

From official sites

 * none so far

From other sites

 * E3 Electronic Entertainment Expo 2006 coverage:
 * IGN Guild Wars Campaign 3
 * GameSpy Guild Wars -- Campaign 3
 * Guild Wars C3 concept art  (7th on page)
 * EXE Guild Wars C3 observations (just a glance)
 * Chapter 3 to be shown at E3 (April 10, 2006)
 * Confirmation of Chapter 3 on TVG (February 24, 2006)
 * Q&A with Jeff Strain on gamesindustry.biz (February 24, 2006)