2.25 is inbound, and it won't stop there. Although to get developing at full speed we'll be seeking more developers (especially modellers/animators/riggers) it won't keep us from putting out new releases as features are developed.
Discussions about future plans include entire class revamps, new "area of influence" system, built in tutorial videos, additional weaponry, advanced research options, even talk of hovercraft.
We also intend to finish adding steamworks, as well as develop a new GUI to streamline the overall playability of the game.
If you don't have it already, get 2.24d and start getting up to speed (there is a dedicated learning centre where you can ask questions and ease into the teamwork based system), or knock out the ring rust and start playing again; the community is growing, and with the new releases we expect it to grow even more.