Re: after integration -> some problems!
Jaithan, I wouldn’t be using WPMU. Rather, I’d be using current WP, 2.3.1 and wait for the WPMU to get upgraded, sorry.
The reasons are that we cannot rely on WPMU to remain stable, since they have to bring that up to 2.3.1 standards. I would suspect that it would be easier to add MU features to 2.3.1 than to bring WPMU up to snuff. For one thing, they went to a role-based authentication/security model, which also makes it much easier to integrate with MediaWiki, BTW.