MTW demo was out quite some time before the game was released,
(a couple of months at least)

if you check the downloads there are about 70 or 80 fan created extra scenarios for the demo,
we were able to tear the histroical battle system apart and make some very very neat historical battle scenarios for the demo.

So the delay in final release was not so painful because we were all having a blast making battles for the demo
:-)

RTW Demo - dunno, i dont think they will give it to us as early as they did with MTW.