In order to build Plasma Active 2.0 you need the following patches for KDE 4.7.4:

kdelibs-kparts_activities.diff
kdelibs-kparts-linkinterface-nepomuk.patch
kdepim-kmail-mobile-commandline.patch
kde-runtime-plasma-privatepackageaccess.diff
kde-runtime-webthumbnails.diff
kde-workspace-CMakeLists_taskmanager.patch
kde-workspace-disable-infocenter-pci.diff
kde-workspace-disable-kcontrol-keys.diff
kde-workspace-ksmserver-qml_shutdowndlg.diff
kde-workspace-kwin-check-opengl.diff
kde-workspace-kwin-reenable-xrender-effects.diff
kde-workspace-kwin-removeShaderSaturationCheck.diff
kde-workspace-kwin-screenlocker.diff
kde-workspace-no-hibernate-button.diff
kde-workspace-wac-html-widgets.patch


For MeeGo you also need the following patches for plasma-mobile:

meego-browser-nogl.patch
meego-build-connman-applet.patch
meego-default-to-connman.patch
meego-installinputmethod.patch
meego-multitouch.patch

The release notes are available at http://community.kde.org/Plasma/Active

Have a lot of fun ;-)