So, I went and picked up my copy of BF4 at Gamestop yesterday, and they told me mine was a limited edition that comes w/ China Rising DLC. I was going to get Premium, but now I almost feel like it would waste the free DLC.
It will only save you money if you plan to play through the 5th and final DLC.
Obviously there are other benefits to premium - 2 week early access, battlepacks, etc, etc. If you see yourself at least going until the 4th DLC drop ($45 total without premium) it's probably best to just splurge for the Premium and get the extras.