Originally, this was planned to be a batch build, with the first batch of 3 (possibly 4) ships being optimized for area air defence. These ships were to replace the since retired Iroquois class destroyers, which performed that role for Canada. It was thought those first ships would have 40+ Mk 41 cells. The remaining builds would be for a GP frigate. Other differences were the radar systems, which on the first ships were thought to be AMDR, with EASR on the remaining 12 ships. However, in the last year or so it would seem that the RCN has moved to build a single common configuration for all 15 ships with a powerful S-band LM radar (based on LRDR). If true, this means any ship could assume the area air defence role simply by having the appropriate missile load-out. In other words, for that role, the 32 cells would all be filled with SMx, and the close-in defence would be handled by the 24 Sea Ceptors in the 6 ExLS cells. For a ship in the "GP" role, there would still be a mix of SMx (presumably SM2) in some of the Mk41 cells (it has been speculated 16), with ESSM quad-packed in the remaining Mk41 cells, plus Sea Ceptor. However, this is pretty much speculation at this point, as the RCN is still in the Requirements definition phase of the project, so the final configuration could again be different from what is seen in the model in the video. It should be noted that over the past 3 years the T26 models for CSC have been quite different, with some having 24 Mk 41 cells, some 32, some with Sea RAM (but no ExLS), and some with Phalanx (also with no ExLS). There are pictures of all these variants on the Canadian thread, if anyone is interested.