Publishing similar but much longer article "again" in different journal? I am about to submit a 3.000 words article. It needs to be submitted soon, and I will have to submit it, but I know that I could flesh this out much more, and arrive at something with around 7.000-10.000 words, if I had more time. However, the basic idea would remain the same. It would be much more detailed, but I would not be making a completely different point.

Could I publish the 3.000 words article in journal A (if accepted), and then later this year publish the 8.000 words version in journal B?
It depends on what you mean by "flesh out". If you mean "waffle a bit more, add some detail to the introduction and discussion" then the answer is an emphatic NO. If you mean "add some further analysis that uses the original manuscript as a starting point and explores a different, previously undiscussed angle", then the answer is a hesitant yes, but it begs the question of whether it would be more effectively presented as a single, comprehensive paper.