Google has announced that they will stop supporting the native Gmail app for BlackBerry devices from the 22nd of November, if you already have the app on your BlackBerry you will still be able to use it, but there wont be any more updates.
Beginning November 22, 2011, we will end support for the Gmail App for Blackberry (installed native app). Over this past year, we’ve focused efforts on building a great Gmail experience in the mobile browser and will continue investing in this area.
Google has also said that after the 22nd of November the BlackBerry Gmail app will not be available to download, you can find out more information over at Google.
Source All Things D