The first "Independence Day" was a major box-office sensation when it was released in 1996. In some ways, it was a revolutionary film in terms of marketing. These days, more and more films seems to be reverse engineered from their marketing campaigns into movies, with little regard for whether or not the film is any good. It's all about how easily it can be sold. You hate today's climate of remakes and sequels and prequels and pre-existing properties above all else? Well, "Independence Day" was a major step along that path, and the only thing that surprises me about the notion of Fox revisiting the property is that it's taken so long.
IESB reports that Will Smith, who has been a major sticking point in terms of getting a sequel off the ground, has arranged now to star in not one but two sequels, shooting back to back, with filming beginning as early as next year. Considering the sort of deals that Will Smith typically demands, and with this being a pair of sequels to one of the biggest films in the company's history, expect Fox to pay out the nose for Smith on these films. I'd wager he won't make a penny less than $50 million on the films before his back-end profit participation even kicks in.
IESB has a particularly strong track record when it comes to rumors regarding 20th Century Fox properties, so it's probably a good idea to treat this like a strong probability.