My guess would be that the 8 of you will sit together if your bookings are associated with one another. I doubt they would add more people to a table of eight. Once you all get your sail & sign cards, you'll be able to make sure you are all seated at the same table. If there is a problem go see the Maitre D to change your seating arrangements. You can call the purser or check the capers to find out where the maitre D is going to be doing seating requests after boarding.