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Google are still building traffic to their local/maps as even they are struggling to get joe public to use specific search tools rather than relying on the general search box. Should the percentage of people going to local/maps increase then so will the update frequency.
There are several aspects that need updating; we've seen regular updates to the related web pages, but Google's decision to break away from using Yell data in the UK means it's trickier for us to sytematically track the updates to their core business data.
There have been elements of updates if you follow comments and responses at google groups /maps ..for business owners.
Responsiveness from Google is not great though. One needs to contact Google within this Group and be very specific and persistent to get corrections or updates for your entries.