> Cloud storage and multi-region replication and inter-region access are changing in pricing.

> The introduction of a lower cost option in archive snapshots for Persistent Disk pricing.

> New pricing for Load Balancing (to bring it in line with other providers. Read: very likely AWS pricing)

> A new price for Network Topology, now included in the price is Performance Dashboard and Network Intelligence Center.

All without what the new prices will be so based on the fact that it is several services with varying prices based on usage it could be a substantial change or not much at all.

Quite vague and unhelpful of a post by Google other than to give you a heads up to not be surprised about your bill in October.

Judging by the comments here, I was right.