My set is on the way also. As for variants, depending on the set you ordered there may be some in there. There could be a pack of rookie variations in there, though those usually come in a cello pack separate inside the box. There is also rumor that Topps released 3 variations for certain rookies indepedent of just mentions. However, those are in addition to the regular set.
However, it is a correct statement that previously released variations (those from the packs) will not be in the factory set.
When night comes creeping in,
Dark restless shades arise.
Prepare to crawl and run.
The Black is here tonight.