So, apparently World of Warcraft now is testing the Free2Play road now, offering free play until your toon reaches level 20. https://eu.battle.net/account/creation/wow/signup/ Some rules apply, though: I wonder if this is a prelude for other Blizzard games.
you can play starcraft 2 for free, and probably diablo 3 will be the same at some point. but for WOW I can't see why people play it so much. for me its not fun. and probably there will be no more expansions
I tried out WOW years back but I didn't find it catchy at all. I have to admit LOTRO (which is actually very similar build up - but based around a sertain known theme) - was much more fun to me. I guess it depends on the kind of player you are. However I can't wait trying out the new DIABLO either. Looks like there's so much more challenges in the stock for us in the new version :)