I remember back when WoW had trait trees, they would release the drafts much earlier than release of the XPac. There would be changes, some major, to what the final trees would be from the drafts, but at least we would get an idea of the changes. It is pretty evident that there will be trees (which I prefer), so giving the users a look even if it's not final doesn't seem like a big deal. If Turbine is worried about fueling the nay sayers... well they will complain regardless.
FYI - Contrary to many people's beliefs that I see on here. WoW now has a very similar trait system to what current LoTRO is.