| Christian Cruz 35 |
Yeah, near as I can tell, but not described anywhere in the current test book, I think most classes would be trained in unarmored defense. I mean despite Sorcerors and Wizards being the glass cannons they always were, it wouldn't make sense to think that anybody that values their own life would train with multiple weapons, learn several proficient skills, and wander into places with monsters and criminals and other things that would mean them harm and just... neglect to learn to physically protect themselves by getting out of the way of things.
Comparing a monk with +4 DEX and expert Unarmored at level 1 suggests an AC of 16, while a theoretically 'untrained' Sorc/Wiz with a liberally measured +3 Dex secondary gets a whopping 12, with maybe a 13 if they Mage Armor, burning one of the impressive TWO spells per day they can cast. While also liberally insinuating that they took Con at a +1, they best HP they can aspire to at Level 1 is 17, provided they chose a Dwarf (That CHA flaw is gonna be real handy as a Sorceror). This power might seem inline with 3.5 PF, but in the 3-action system that allows multiple attacks from level 1 without the grace of the BAB limiter, such a criminally low AC and health is just begging to get destroyed by anything wielding a bow.
14 isn't all that high of an AC, and again, this conservatively assumes the Wizard had the foresight to consider all the dodging it might have to do, and not just live life as a mental skill machine. Zero DEX with a -1 Proficiency registers at a grand ol' 9 AC, 10 with Mage Armor, 11 with Shield as well. Under the 'meets it, beats it' standard, that's a raw 50% chance that anything that wants to Strike at you will just... absolutely brutalize any Level 1 caster before they even get off the ground.
In short, they're probably going to amend this somewhere in the final book under Armor Class, but as multiple people have stated that the demo sheets include the +1 Proficiency for casters and providing this reasoning as to why a -2 on the class with easily the lowest starting AC, you should feel safe just saying all classes are considered trained in being unarmored.
Also +1 to adding a 'no armor' stat block to the finalized sheet, since sleeping in armor fatigue IS still a thing and not even counting that, there's probably numerous circumstances in which a PC can find themselves missing their trusty metal life preservers.