We've just made a long-awaited discovery: Greenlight, the mysterious Siege special format release in a pack with Battle Master Dazlestrike that we first learned of through leaks something like six months ago now finally has a release date on the horizon, and you can get a preorder on Amazon right now.
To do this, we need to use what's called "the wishlist trick" because the product listing page is not viewable itself just yet. First step is to click this link. This takes you to an Amazon page asking you to confirm you want to add "Currently unavailable" to your wishlist. Click continue. This will add the item to your default wish list. Now go to your default wishlist (the page confirming it was added will probably have a link straight to it). From there, find "Transformers Tra Wfc DLC Greenlight with Battlemaste Toy" which should be right at the top of the wishlist - or the only thing on it at all if you don't typically utilize this Amazon feature. You should now have a preorder button you can click, which will add it to your cart. From there, just check out as normal.
Greenlight is due to be released on July 1, and is priced at $24.99. We don't know right now whether this might be an exclusive to Amazon, though that's not expressed in the product title at least. Hasbro Pulse and other online retailers may very well begin to offer this as well, later on.