I recently joined your signature campaign and I wanted to try the service I am trying to advertise, the home page is simple but it contains a lot of unnecessary data, for example
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If the mixing service for these altcoins is not ready, do not indicate it on the home page.
I wouldn't say three icons is "a lot". And I don't see how else UniJoin could highlight what services will be available in future. I'd say it depends on the timeframe. If support for those other currencies is more than a few months away, then perhaps it is unnecessary to show. But if it's only a few weeks until users can utilise that service, then they should be informed of what's in the pipeline.
Ever watched a movie trailer before? The movie likely isn't ready yet, but it gets peoples' attention. There are many examples of media to show off what people can look forward to when something isn't yet finished. I don't see why this should be any different.