Nobody has played one yet, so all integration has been on the DM side. Fortunately for me, the integration was a bit less radical.
TLDR version: The changes happen to fit nicely into the Lore of my homebrew, so not much was needed to change. I just added the 'new' subtypes and explained they were a bit more rare.
Prior to 2024, the Goliaths were the chosen of Melora. They were created by her in my lore when the Gods discovered that granting free will to mortals would allow them to worship, and via that worship gain power. In response to the realization, each God crafted their own version(s) of mortals and imparted free will to these new beings. The goliath were a reflection of her. In my setting, Melora is a Goddess of 'nature', but not beasts per se as that is the purview of another God. Instead, her domain covers the elements and plant life. She had carved the goliaths from stone and they'd retained their tie to elemental nature. As adventurers and leaders of their clans they were often cleric, druids, barbarians and 4 element monks.
With the 2024 lore I essentially just added to the existing lore by stating the other 'new' goliath types had always been there, but they were just less common. They do not have 'giant blood', but instead the giants were an inspiration for Melora when she crafted these beings.
Giants in my setting were some of the oldest free willed beings (although they never had love the Gods). They are very much tied to the Elemental Chaos from which they sprang. That chaos was a remains of the hundreds of thousands of years of battles between Tiamat and Bahamut. Tiamat's attacks on her brother spewed elements into the universe while Bahamut's breath infused life into the elements - which gave us primordials (which are nearly extinct), giants and dragons (the first three species). All three of these species are closely tied to the elements because of their origin as manifestations of the elemental chaos.
Melora essentially copied this formula when crafting goliaths and made them "mini" giants. As her domain are the elements from which the giants sprang, it made sense that they'd be crafted in much the same way. Generally, their clans retain the cultural lore from the 2014 (and earlier) materials in terms of their affinity for competition, the desire for fair play/lawfulness, their independence, and the expectation that goliaths should always prove their worth and mettle. This is not a requirement for PCs, and there are clans that have broken with these beliefs, but these ideas remain common amongst tribes of goliaths.
