With planets and bodies of water being added in 3.3, will we see atmospheric planes (aka non-spaceships) and aquatic/amphibious vehicles concept sales this year?

It's not something this year, no, for sure. It's nothing we're actively designing or planning for. Doesn't mean we're never going to do them, but it's not something that we're considering at this time.

Just to reiterate that, just because you said not this year: right now, at this moment, we are recording this on August 15th. There are no plans in motion right now for boats, submarines, or airplanes as it is. Doesn't mean plans won't be made in the future. We're not going to say no. Just that we can't say yes right now because there is no yes at the moment.

There's lots of cool possibilities that we could do with them. Some are quite exciting, but as you say, there's nothing written for them yet.