Making hobby projects ipv6-only would be a start.
(Although there's no mention whether HCloud ipv4 pricing is actually affected by those changes)
CX11 goes from 2,49€ to 3,49€ excl. VAT, CPX11 from 3,49€ to 3,99€.
New Floating IPs will also cost more from 1st August - 3€ instead of 1€.
This does not affect existing instances and existing floating IPs.
Source: Received an email from Hetzner as a customer with the affected instances.
https://lists.freebsd.org/pipermail/freebsd-hackers/2013-Apr...
IPv4 was added a few weeks afterwards.