Something to keep in mind is that we are most likely going to see more patches added in before xpac release. Yoshi-P's aforementioned 2.56 patch, for example, could house the tome cap removal. It may even be possible that it was accidentally not included in the patch notes for 2.55 (though this one is far less likely).
Whether or not they remove it doesn't seem like a big deal, one way or another, but I wouldn't put it past them to want to stretch out the grind a little longer until June, given that this is a new approach to an end for everyone to see in FFXIV. But if that were the case, I'd think this would be how it plays out (and somewhat of why).
2.55 - Remove cap on WoD and FCoB loot. Give WoD gear wider use, which wouldn't happen if poetics cap were removed at this point, and keep Poetics weapons from being looked at the same as Soldiery weapons.
2.56 (maybe in a month or so from now, i.e. early May) - Remove tome cap. Allow people to get pretty much everything they'd like to get before Heavensward.
