They added 12 more octets. I mean we could have written IPv6 addresses in the old format but I don't think that

42.0.20.80.64.1.192.15.0.0.0.0.0.0.0.113

is easier to remember than

2a00:1450:4001:c0f::71 (or 2a00:1450:4001:0c0f:0000:0000:0000:0071)