Objectives may be neat, but don't expect those to be added to the current maps. Seamist of course being the exception that it itself has the one objective of defending/destroying the Allied Radar Dome. When it comes time to the release of the APB Source Development Kit, or SDK, you and everyone else will be free to experiment and conjure up new maps and even create mission maps.
To the subject of the cruiser; the official stance is the cruiser is not happening. And that is all that needs to be said on that.
More CPU is doable, but you have to consider the increased costs that puts on the infrastructure. The servers are maintained at a reasonable cost, and it's best to keep it at that. You may have to wait for an informed answer on the multi-threading/one core question.
Divide the maps in what way? Infantry, All Out War, Objective; it all goes into the map rotation. I do see your idea of hovering over the current map in say, the server browser and it showing you if it's infantry-only, AOW, or otherwise. I'll ask if this is possible within the launcher.
It shouldn't be difficult to get people to try this out, you are correct. It's the matter of getting the word out, as such is PR. I like to believe we are doing fairly well in that department, and with each day we endeavor to welcome more people into our community. The ideas that have come from this thread and from others in other sections of the forum will prove helpful.