Can you no longer lease a vBulletin license, because its no longer available on the site, or is that just for the Pre-Sale?
This question is answered in the FAQ of the new vbulletin.com site. Leased licenses are gone -- when your lease expires, you will need to either upgrade to an owned license or remove vBulletin from your site.
I'm not Lynne, but yes, you are correct, this is a pre-sales forum. However, it is for the "modifications"-type pre-sales questions. Questions that warrant an official answer (like this one) should be posted over at vBulletin.com.