1) We really need to get some links to freebie worlds in the new KWC - worlds that are open to any Kitely member, not just premium members. People are not gonna react well to the idea of having to pay real cash to get access to stuff advertised as "free".
2) I agree completely with those who say that it's a really bad idea to have any worlds highlighted in KWC that are not accessible to any Kitely account. Again, it seems too much like you're forcing people to pay for membership to get anything useful.
Back in 2007 I started playing an MMORPG called RuneScape (which I'm still playing 7 years later). I started out as a free member of RuneScape but didn't last five full days in that status. By the fifth day I got tired of not having access to so many things and became a paying member of RuneScape. It could easily have gone the other way and I could have stopped playing rather than paying for membership. But after five days I was irritated enough that *something* was going to happen.

There are many differences between RuneScape and Kitely, needless to say. One of the major ones is that a paying membership in RuneScape only cost $5/month, which is a big difference from $20/month when you are talking about online entertainment. So it wasn't too hard for me to decide to just pony up the $5/month and become a paying member for full access. If the price had been $20/month I would have been a lot more hesitant to jump in so quickly, and much more likely to eventually leave in frustration.
The other major difference is that RuneScape already had an established community within the game - even free game worlds were loaded with other players much of the time. So the social aspect was there to see, even for free. Until Kitely gets a critical mass of residents to provide the ready social infrastructure, you need to be careful not to do anything else to scare people off - the lack of people on most worlds much of the time is already a huge barrier to people deciding to settle here.