The fact that player behavior may change is a poor excuse. Aeonics can already be made, so giving a hint as to what trial is needed for rem's for an update 2 months away would most likely help. It would put people's minds at ease about what the trial will be (or cause people to quit, as I and others will most likely do if its stupidly difficult - I am sadly betting on this one being what the player behavior comment was about), but it would allow rem's to catch up to aeonic power more quickly when the update comes out. The last "great challenges" - as the devs have said non-afterglow holders will have - we were given were relics at lvl 75, mythics in general, pandemonium warden when it came out before it was nerfed, etc. That is not a good track record for making people think it will be an accomplishable goal. Giving a hint as to item needed or a quantity needed would most likely calm a lot of the enmity from the player base.
As to the previous post saying to just not upgrade the weapon if it is too difficult, we worked for the weapons and put more blood and sweat into making them than any Aeonic user will most likely know. We were then forced to upgrade them. We were fine with this, even if it wasn't free (which the prior post seems to insinuate). The part we didn't like was the near impossible goal after what we had done of Afterglow. Before it was nerfed, the time requirement was so high it was laughable. That alone sets doubts in the minds of REM holders as to what the last trial is. I sometimes feel that the trials aren't even tested well based on the factor of time. So many trials come out or fights get created where the player base goes, "Did they even test this? What where they thinking?" and then creates a backlash at the devs (and sometimes news stories) until it is "nerfed" (AKA fixed to a reasonable level - although even current afterglow requirements are still not reasonable for the boost they give).