I'd say the correct answer is, as usual, "it depends".
If the "coming soon" message is framed as a marketing tease and the features are indeed delivered as they've been promised then I don't see a problem. OTOH, if the "coming soon" message itself looks like a poorly styled afterthought then, of course.... just leave it out and rethink the rollout.
Ultimately, "ugly" is a matter of presentation and perception.