As announced on the Merkaartor mailing lists, version 0.16 is planned to be released on 6th June. Therefore I've uploaded a git snapshot to experimental today. Please give it a try and report all problems, either to the Debian BTS or directly in the upstream bug tracker.
Version 0.16 will contain a lot of new features and various bugfixes and enhancements. For me the most important additions are support for Walking Papers and support for OpenStreetBugs. Also Merkaartor uses libgps now, so it is able to connect to recent versions of gpsd. With thanks to Chris Browet, the upstream author of Merkaartor, the next version of gpsd will ship with libQgpsmm, a C++/QT library to connect to gpsd. It should be possible to compile libQgpsmm under most platforms which are supported by QT4, including windows. Merkaartor will use libQgpsmm when available, so even Windows users will be able to use a remote gpsd instance.