The stable upgrade from KDEPIM 18.104.22.168 to KDEPIM 4.7.3 is a MAJOR upgrade with potential for major breakage. Therefore we will try to keep and support the old, so-far stable KDEPIM 22.214.171.124 as long as possible.In addition there have been a few reports of problems with the Plasma desktop after upgrade. Usually these are caused by single plasmoids malfunctioning, so what should help is to remove some of the plasmoids from your desktop and add them again... Otherwise the upgrade from 4.6 to 4.7 should be pretty much unproblematic, and bring you a shiny new desktop with quite some new features.
If you don't want to upgrade your KDEPIM yet but keep the old version, please download this mask file and add it into your /etc/portage/package.mask.
If you decide to upgrade, please have a look at the upgrade guide first.
With the new KDE we have finally also been able to stabilize a newer version of digikam and kipi-plugins (both at 2.3.0 now!), and also rekonq gets a big bump to version 0.8.0, which should fix an overdue security bug.
Finally and not related to the stabilization, since yesterday we have a package in the main tree that provides integration of Google calendars / contacts into Akonadi: kde-misc/akonadi-google ... It's a bit experimental still and also not an official release but a packaged snapshot, but anyway, if you are interested, give it a try!