I installed 8.0-CURRENT-200812-i386 (minimal install from CD, ports - snapshot from ftp), then Xorg 7.4 (from source), then KDE 4.2 (from source).
So far I have no any problem with new Xorg (everything is working fine without tricks: moused, dbus, hald -enabled). First impression from KDE 4.2 is quite positive, far better than 4.1.4. I could compare 4.2.0 with 3.5.10 by speed and stability...well so far
. The install took me 2.5 days from early morning till midnight (+ night hours up to next config screen) but I feel it worth it.
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H/w: Asus M3N78-VM, GeForce8200(onboard), AthlonX2 2.3GHz (4450e), DDR2-800-4GB (2.4GB-available), SyncMaster2253bw 1680x1050_60, ps2 kbrd, usb-mouse.