yeah it says 6 weeks, but as someone below also said they are second hand reviews.
Now lets took a look form a complete transcript form a SWTOR livestream with the devs :
"Q: How is the 6-8 week time frame for new content going? Hickman: It's difficult, but it's going well. We'll probably have a 9 week period between the next update and the one after that just so our team can enjoy the holidays a bit. They were all in the office last year during the holidays for the launch, so we want to give them some time off this year. But after that, we should be going back to the 6-8 week turnaround time."
So second hand reports or direct from the devs mouths... hrmmm i choose option 2