"Will be recommended for publication in IEEE Xplore." What does it mean?
If it is an established IEEE-sponsored conference, then I would expect that it means they will definitely be published in IEEE Xplore.  Typically, the IEEE simply transforms the conference proceedings directly into an IEEE Xplore collection, and that is the official archival proceedings of the conference.  

The only publications that typically do not make this transition are those which are not presented at the conference (e.g., the authors don't show up), which the IEEE does not generally allow to be published as part of the final proceedings.