Amazon has started to send out emails to those that preordered their Exclusive The Vintage Collection 3.75-Inch The Bad Batch Special 4-Pack stating they are scheduled to arrive this week.
The estimated delivery date for my preorder is 2/18, which is just a few days away.
Remember Hasbro has stated that more of these sets would be available, but currently its not known when.
Here is the product page if you want to check it from time to time.