OmegaWiki may be a lot, but it is not encyclopaedic. We do not want to be; Wikipedia does a great job at it and when it needs competition there are plenty of pretenders to its throne. So we do not compete.
When people need information, OmegaWiki will not provide all information. What it can do is link to other sources of information and Wikipedia is the obvious and the only choice for encyclopaedic information. It is the only choice because it aims to be multi-lingual and it is an obvious choice because of the shared values.
At this stage, linking to the Wikipedia articles is done by hand so initially there will be few links. We hope to harvest these links from Wikipedia and insert them with a bot. In this way we will provide an encyclopaedic service without being encyclopaedic :)