According to Grinding Gear Games, the next expansion for Path of Exile is in the works and will be discussed on May 21st alongside the new Challenge League. This comes courtesy of a post explaining that the current Synthesis packs will leave the store at that time.
There are two pairs of the Synthesis Supporter Packs available in the store, the Sunstone Supporter Pack and the Doomcrow Supporter Pack. Each of the two pairs is designed in a unique style and has different contents, so you can choose whichever one (or both) you prefer. You can upgrade from the smaller one in a pair to the larger one. All the microtransactions from the Supporter Packs are exclusive and will never appear in the store again, including Hideout templates.
For ARPG fans, Path of Exile has long earned its reputation as one of the best ever and GGG continues to deliver outstanding content. We can’t wait to see what they have in store for players in a couple of weeks!