One PluginTest test is failing consistently when building accounts-qml-module against Qt 5.2.
To upgrade to the Qt 5.2 easily (now possible on desktop where all dependencies are built):
apt-add-repository ppa:canonical-qt5-edgers/qt5-beta2
apt-get update
apt-get dist-upgrade
See/describe dependencies of packages at http://pad.ubuntu.com/qt52-dependencies
See build logs at https://launchpad.net/~canonical-qt5-edgers/+archive/qt5-beta2/+sourcepub/3830277/+listing-archive-extra
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task-0: ********* Start testing of PluginTest *********
task-0: Config: Using QtTest library 5.2.0, Qt 5.2.0
task-0: PASS : PluginTest::initTestCase()
task-0: QDEBUG : PluginTest::testLoadPlugin() virtual void OnlineAccounts::Plugin::registerTypes(const char*) Ubuntu.OnlineAccounts
task-0: QDEBUG : PluginTest::testLoadPlugin() account-service-model.cpp 286 update
task-0: QFATAL : PluginTest::testLoadPlugin() ASSERT: "last >= first" in file itemmodels/qabstractitemmodel.cpp, line 2631
task-0: FAIL! : PluginTest::testLoadPlugin() Received a fatal error.
task-0: Loc: [Unknown file(0)]
task-0: Totals: 1 passed, 1 failed, 0 skipped
task-0: ********* Finished testing of PluginTest *********
---cut---
All Qt 5.2 related bugs can be seen at https://bugs.launchpad.net/bugs/+bugs?field.tag=qt5.2 - this bug may be related to an upstream problem as well, or a real change that needs to be taken into account. Any fixes should be made so that the code works with both Qt 5.0 and 5.2 (eg by using #ifdef:s and so on).
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