The Sims 3: Island Paradise comes with Isla Paradiso.
The Sims 3: Into the Future introduced a fifth sub-neighborhood named Oasis Landing.
Electronic Arts cites the reason for the delay was to "create awareness for The Sims 3". It shows something towards a continuous, panning neighborhood, diagonal placings for objects, better lighting systems, and the ability to change shoes in the CAS, an ability previously limited to only console versions of The Sims.
Before it was delayed, it was originally to be released only on Windows but after the delay, it is available on both Windows (Windows 98-10) and Mac OS X, which makes this the first time EA released The Sims on both Windows and Mac OS X (EA only made the Windows version of The Sims, The Sims 2 and The Sims Stories; Mac versions were made by Aspyr Media). The preview only lasts about one minute, and has poor resolution.
Alternately, you can set up your own little Soap Opera, or recreate your favorite fictional characters, or even just play normally. The two sequels also have a number of "Stuff Packs" associated with them; these only provide new objects as opposed to gameplay functions.