Sounds right.  ID Software seems to know how to rapidly produce a game for
an engine in order to test it, even if it is not the best game of all time.
The rendering engine was obviously completed some time ago, meaning that
they were already working on the gameplay at this stage.  

There are also complaints about Co-op being left out from the PC version -
meaning that it is definatly in the final testing stages.  

Won't be buying it straight away - I'll see how it works from what my
friend tells me.  

Officially it is the summer.  Hell it could well be a bit earlier then that
fingers crossed.