Obviously we won't be getting skill trees with the expansion, but what we do get from 50-60 should be an example of what they're willing to try and/or do. If we only get a few skills/CDs total per class I'd be pretty disappointed, but it's to be expected. At this point there seems to be a major disconnect between what the devs believe "hardcore" is and what players actually demand.
Yoshida has stated in the past that Heavensward is going to be more "hardcore", less forgiving than the trial that was 2.0, but we won't know until we actually get to play it. Similar to all the previous patches there are plenty of players who are expecting some significant changes, more difficult enemies, greater variety in stats and unique abilities, a reason for elemental resistance materia existing, and so on. Unfortunately, I don't believe we'll be getting much of any of this, except for possibly the first. The live letter already told us that they're sticking with their tomestone system and are even adding it to crafting in a vain attempt to reduce some of the player monopolies at the top. We haven't been shown any actual gameplay with the expansion being almost 2 months away at this point that would demonstrate new abilities or systems they've put in place. Other than one of 9 open world zones, which include Ishgard and Dravania, we've been shown practically nothing of value with regard to the expansion. Admittedly, I was impressed at the size of the zone they showed off, but it has me worried if all they're willing to show is a single zone.
I think everyone would point out they're holding off on showing material because of the time until the expansion release and the fact that it follows soon after E3, but the lack of any tangible information at this point is a sign to me that the expansion will fall below many players' expectations.
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