Apart from availbility, there might be another fundamental question: Do you want to create cool, good-looking maps with lots of details or are plainer maps concentrating on the information relevant for the gameplay sufficient?
If you look at the Dndjinni forums and the user-created maps shown there, you see real pieces of art, fit to be used in a professional product. But you'll have to invest time in each of those maps, even if you are a talented guy and have mastered the learning curve of the tool.
WotC's offer - if it really is published at some point in the future
- will probably allow you to produce decent looking maps without so many possible variations in a short amount of time.
If plain maps are okay with you, you might also go the dummy way. Use a drawing program like CorelDraw or OpenOffice Draw, set up a 1-inch grid, draw your rooms, use a simple fill for the floor, and add several objects (rectangles, circles) for items like furniture. Ugly as the graphics of a 1980s Atari video game, but ready in 10 minutes.
It only looks a little better than a battlemap drawn by hand, but meets the goal of being prepared beforehand.
Note: My Artistry skill bonus is at about -20. If you have invested skill points and maybe a feat into Artistry, your results will no doubt be better looking.
Huldvoll
Jan van Leyden