Not in the dockyard area, but they are looking more down by Shearwater (which may need another firehall and other things). Will be a much better commute at least for a lot of people, and then hopefully surface ships won't be fighting for the same FMF resources and playing second fiddle to them like we do now. All kind of depends if we actually commit to 8 or 12 subs though, as well as figure out where they are based. Esquimalt is even tighter for space, so maybe make sense to look at a standalone sub squadron base on the West coast, and consider the mainland as well.
Halifax in general is already going to need significant infra upgrades to the dockyard for the surface fleet, which is ongoing, but also the training schools, ammo depot and a lot of the Shearwater RCAF related infra is on the wishlist.