Here's an embed from Collider in which some of the same material is covered. In it, Devlin also indicates an ID sequel would be set in real time - i.e. it would be set 16 years (or whatever...by the time it's made) after the first time.
ComingSoon has a brief discussion with Dean Devlin regarding the status of that INDEPENDENCE DAY sequel about which we've recently been hearing murmurs. Sounds like he's very happy that he and Roland Emmerich have finally developed a story which is a sequel that "won't disappoint the fans."
I've heard an insane number of rumors about this project over the years, and have NO IDEA whether any of them are in any way accurate. One idea I've heard mentioned is that a sequel would pick up on Earth, in real time (i.e. decades later) and deal with the aliens coming back for more. However, this time, they find our society and technologies retrofitted by the alien tech recovered from all those crashed vessels at the end of the first film...so we're far more ready for 'em this time around...with human/alien hybridized weapons and vehicles...thus the fight has a very different complexion. Another rumor (part of the above rumor? Something entirely different?) was that one proposed notion would have humans finding a way to take the battle to the aliens...
Whether either of these concepts were ever actually considered to begin with...and whether either would pan out if this sequel gets made...I have no idea. From the sound of Devlin's interview, it sounds like...even if the above concepts were at any point true...they've recently found a fresher approach which could theoretically dismiss any rumors we've heard before.
So, time will tell...perhaps...hopefully.,..'cause I, for one, would actually really like to see another INDEPENDENCE DAY movie (the first one will return to screens in a 3Dified form July 2013).
For now, you can find the entirety of Devlin's ID4 sequel comments HERE...which include...
There are a lot of moving pieces that are coming together. I don't know if it will come together, but we want it to happen.
...ten years ago I was hired to write a sequel to 'Independence Day' and they paid me a lot of money. After I finished the script, I gave the money back and I said, "Don't even read the script. The script is okay, but we can't make an okay sequel to 'Independence Day.