Version 1.31 is now the default JavaScript version for Version 1 of the API. This version has the same enhanced imagery as Version 2, as we mentioned when we released 1.31 a couple weeks ago. The old imagery may still appear on those sites that have hardcoded an earlier version of the API, and we plan to keep the old imagery around for 1-2 weeks so that you can update your code to the latest version. The old imagery will eventually be turned off, so please update your code if you have hardcoded an older version of the API (v1.30a or earlier) on your site.
As always, please report any problems on the Maps API discussion group.
API v1 Current: 1.31
API v1 Default: 1.31
API v2 Current: 2.45
API v2 Default: 2.44