Blizzard has released another balance testing map, called "Antiga Shipyard 1.5.0 Balance v1.0, which seeks to test certain balance changes before they are implemented into a full, official patch. The changes that are being tested (and are only in effect on this map) are as follows:
Creep tumor build radius, vision radius, and creep spread radius decreased from 10 to 8.
Raven movement acceleration increased from 2 to 2.25.
Raven movement speed increased from 2.25 to 2.5.
Another one of these "Call to Action" maps was released months ago, as seen here, which is good evidence that Blizzard intends on gathering feedback on a regular basis. Giving players a chance to voice their opinions before heavy changes are made to the game is a much-appreciated decision from Blizzard. For the full post, click here.
Battle.net - Call to Action: Balance Testing