WhatsApp 18.104.22.168 is now in the Windows Phone Store, and will install on your Windows Phone 8 handset.
There do not appear to be much obvious improvements â€“ in fact smilies have disappeared, and the app does not appear to be using fast resume from the live tile or any other Windows Phone 8 specific APIs, which does make one wonder what the wait was all about.
It does start up pretty fast however, which is not to be sneezed at.
The app can be found via the WhatsApp download page here.
See a video comparing the WP7 vs WP8 versions, via MNB, after the break.
Thanks everyone who sent this tip in.