The NSFW deck is on sale and most likely would have been in any event, although I agree it is a bit sooner than I would have liked as there are shipment orders still not delivered.
However, If you read the buying page carefully:
The Standard Box:
Family friendly, party game for 2-5 players.
Can be combined with a second deck to play with up to 9 people.
Includes 56 cards (2.5 x 3in), box, and fold-out instructions.
This box, like 99.99% of boxes, does not meow.
The NSFW Box:
Contains the full version of Exploding Kittens, but the artwork on each card has been replaced with content too horrible/amazing for the regular edition.
Can be combined with the regular edition to play with up to 9 people.
Contains an excessive amount of butts and boobs and dragons.
The First Edition Box:
Hinged magnetic lid.
Contains a delightful surprise.
Can hold up to two decks in one box.
Has an Exploding Kittens storage pocket.
The last one should never go on sale apart from the left overs of the manufacturing process, after shipping and replacements of lost shipping has occurred.
Box with Surprise is still KS Exclusive. Standard box does not Meow, is only a box. Standard Boxes and NSFW Decks can now be had by all.
Remember that we had 219,382 backers and production runs in round number, plus they said that some extras would be created to account for lost shipping items, so lets round that up to somewhere in the 225,000 to 240,000 range to account for ~10% shipping failures, yes?
Hearten up me Kitties! All is not Doom and Gloom! Keep your heads together and let's weather the comment storm that is approaching.
All info is available and can be confirmed by anyone, so let's help the other backers understand that they have not been done a disservice. (opinions may vary, your results may vary, we might also have to move into Prof F's Moon Base for a while.