BridgeDB should be able to return multiple transport types at the same time
In https://lists.torproject.org/pipermail/tor-dev/2013-March/004505.html we decided to add a "Get Bridges" button to the HTTP interface of BridgeDB, which will provide users with bridges compatible with the latest obfsbundle.
This means that if the latest obfsbundle supports both obfs2 and obfs3 bridges, the "Get Bridges" button should return both obfs2 and obfs3 bridges (and some normal ones too).
The current BridgeDB code does not allow to return multiple types of bridges at the same time.