HH6702 - not sure about the 767 doing EWR it is planned to be based at NCL if the deal happens but what they use it for - not heard a rumour on that one.
The plan is if the 2 x weekly 757s become popular then they may consider increasing frequency however they, as far as I understand, are looking to keep it at twice a week even in the Summer. Lets hope it can start for the Winter but I suspect that we may have to wait until summer 08, apparently extra life rafts have been added already to one of the NCL 757s as part of the ETOPS work they need to undergo not sure how far they are in getting the other work completed.
On the GSM to SFB - this is an annual rumour and not sure given the mess they have made of long haul elsewhere NCL would really want then anyway.