This is going down a bit of a rabbit hole, but the quote from BVVD in Dec was “Yes, we have plans for playable submarines, but no further details on this yet.” That’s what he says whenever the change is (1-n) years in the future. I haven’t seen anything clarifying since that would trump that from Gaijin. I agree they’re a natural counter to BBs and are still likely to show up eventually. The real limiting factor on that was always the effort required to retool the subsurface areas of existing random battles maps, which are often simply not deep enough at present. But yeah, we’ll still likely see subs before carriers or post-war missile boats (both of which face much bigger obstacles). I just don’t think it’ll be 2025.
Getting back to the subject, I think it’s also important to note how balanced Naval is now at 5.7 and below. I think it’s one of its strongest features as a mode. One way to express this mathematically is the chance of being in the top BR of a match (yay!) minus the chance of being in the bottom BR (boo!). In a perfectly balanced game with 4 BR steps this would always be zero. As you can see from the graph below, naval isn’t doing too badly, up to 5.7, it’s keeping pretty close to the “fair and balanced” line. 2.0 is fun, 2.3 kinda sucks, from there it’s a pretty smooth progression up to 5.7 as the sweet spot, from there you want to skip right to 6.7-7.0. This will of course all change at the top end with BR decompression as I mentioned but the principle then will be the same.
EDIT: The other two modes for comparison: