As you know, I've hopped on to have a peek. From what I could access it seems that free players are allowed to be all the main healing classes and some classes they played more than 7 days in a certain Ywain period of time. Meaning that I can play my latest creation, my ranger, but I cannot play my older mid ones like sb or both my shamans (eu and us versions I guess).
I also read that there is a period of downtime required before a paying account can go into the free playing mode. Then there are also the limitations, where you can only use the RP up to RR7. So not sure if it's worth the wait for you.