I just got 0.61. Technician access, which is supposed to include exclusive characters and toys, but I don't see anything that wasn't present in 0.52. Griffin's Nest is the major expansion, which is full of potential, but hella grindy to unlock. I recommend upgrading power generation and mosquitos first, as they expand your options soonest, though DNA storage is cheap enough that it won't set you back too much. I got 500 starting coin, and more can only be earned by selling DNA samples sight-unseen, which means you don't get to preview what they would've looked like. Human samples sell for 25 for Common, 50 for Rare, 150 for Epic and 300 for Legendary. Only seen Humans so far because I upgraded Incubation first, which generates from DNA faster but not with higher success rates. For that you need to spend into better emulsion, which costs up to 200 to reduce fail rate to 5% -- so failure is always an option and paltry DNA quality is frequent, and your only remedy is moar grind
Aside from creating and fusing, there's naught else new -- same characters, same customizations, same maps and props. Sounds like the same voices as well, but maybe the new races will sound different, if I ever unlock them.