The current version of X-Plus, 1.0.1, will work with all versions of Weaver Xtreme 1.0.2 and later.
Weaver Xtreme Plus 1.1 requires Weaver Xtreme Version 1.1.1. It will be released within a few days of the WordPress.org release of Weaver Xtreme 1.1.1. As you all may know, WordPress.org must review every update to every theme in their repository. This process is running about a week or so now. Weaver Xtreme 1.1.1 is in the review queue about 4 or 5 days out at this time, although they sometimes seem to catch up over the weekend.