no.. some cases get sent to local office for interview... for whatever reasons. Some said to speed up the process so that not so many pending in one big center like NSC. Some said it get transferred to local office because of the DWI? or other violations... my case was because of recent marriage so that my gf. (now wife) could get on the boat. I used to think those got sent to local office were the unlucky ones because it meant more wait and more interview.... it turned out that local interview was really easy. Only 20 min top (my case). But if you have something to hide, better go in with a lawyer.
My experience is, when it got transferred to the local office, it is then up the local office to approve or deny. If you have nothing to hide, it should be approved right on the spot (PD is current), otherwise, after the interview, wait until the PD is current, go for infopass, do whatever you can to make them put a temp. PR stamp on the passport because when your PD is current, you can get them approve right the way. This is the only time you can decide when you get approval for you gc. That's why now I think for those get transferred to the local office could be the lucky ones (unless you have something to hide).
If you had the local interview before and PD is current now, don't wait the local office will review your file and approve, it could take many months (my lawyer asked me to wait 2 months, yeah right... i ain't that dumb.)