they've been talking about sequels for years haven't they ?
Yeah, but this time Roland Emmerich and Dean Devlin (ID4 creators) are finally stepping forward confirming that they want to do it. And they actually wrote a script. The film studio has been wanting to make a sequel for years now. It's all just a matter of fine tuning and finalizing the script.
I expect that the first sequel will be released during the summer of 2015 at the earliest.