Google announced on Google+ that they can now automatically spend twice your average daily budget in order to help you reach your goals. This will not result in you spending over your monthly budget, but it can mean your daily budget is doubled on some days and a lot less on other days.

Google wrote:

I assume Google was missing out on monthly spend because of the daily budget limitations and now Google is able to fully use everyone’s monthly budgets this way.

Not sure if all advertisers are happy about this but I didn’t see too much chatter around this change yet.

Forum discussion at Google+.