That's not bad, but you can do much better. If, in addition to your advertising copy, you can provide some uniquely-valuable information to the Web, the traffic to your site will be much improved. Or, you might take another approach to the problem and associate your site with a dedicated content-provider. Other poor ideas. The Under Construction symbol.
Every page is usually under construction.
Don't put it on if it's not ready, but don't advertise your failure to get the job done. Coming soon is a fine line, but not pardon our dust or some other term that reminds one of a road project that will be complete in late 1998. There are other ones, like Click Here rather than saying what your're clicking to see. Surf the Net and you'll soon find other small, but bothersome, things. Not that important, especially if you're on John Smith's home page with huge multiple graphics that never loads fast enough anyway.