I got the following from a relatively reliable source at LX:
- Airbus 330 (and likely 350) will get 3F seats (or 3.5 if you count the 0.5)
- 777 will get 2 rows of F seats (which I would assume would be 6 (or 6 + 2x0.5).

So, not sure where and how the 5 are coming from. They even already published the seat map for the A330 refurb where it is clearly visible that it will be 3.5.