Are there any plans on releasing a landscape editor on PC? Actually, it would be cool if you could draw any 1-bit (black and white) image, download it to PSP (or DS) and use it as basis for custom landscape.

Landscapes would be so much easier to create with mouse rather than PSP's somewhat restricted controls.

For DS: highly unlikely, there's no support for it in the game, and it's not possible to add it to the game at this point, the DS's landscape editor works pretty well anyway ;)
For PSP: Don't know for sure, but I really doubt it.

edit:
This is up to THQ and T17 really, but from a technical perspective, I don't think a PC landscape editor will be added.

For DS: highly unlikely, there's no support for it in the game, and it's not possible to add it to the game at this point, the DS's landscape editor works pretty well anyway ;)
Well, but savegames can be loaded to PC and back again with an Action Replay MAX Duo, Supercard SD or MiniSD (with ReinMoon), or this nifty device that just came out:
http://www.newlaunches.com/archives/gametechs_nintendo_ds_save_game_transfer_system.ph p

But yeah, I wouldn't expect an official editor to come out, and unofficial editors are a double-edged sword. They kind of ruined the U.S. Animal Crossing network (though Japan was/is still mostly fine :) ) when people gave themselves tons of Royal Crowns (the most valuable item in the game) and hacked items ("seeds") that can be used to destroy others' towns. I doubt W:OW2 has such a potential for abuse, but I can see people using editors to unlock all the unlockables without earning them and so on. :/