Google, seems like over the past few days, has initiated a major algorithmic change that has changed how the local results rank in both Google Maps and the local packs in web search.
It has been speculated that the Google Maps Googlebomb fix led to this and one can expect the traffic change to an extent for many local businesses in the future. The issue seems to be related, but Mozcast features shows the shift on the 15th.
Tons of local SEO experts on the Local Search Forums have been documenting the change. Mike Bluementhal has been calling the location results screwy and the forums are lighting up around this.Google Initiates Local Search Result Ranking Changes!,