Deset Gled said:
Well, it depends on what one considers 'errata'.
"We've found a cut-and-paste mistake from 3E, so that the effects of enhancement bonus on hardness and hit points of magic weapons appears differently in two different places."
That's an error.
"Spell X states 'Spell Resistance: No', but it should be 'Spell Resistance: Yes'."
That's an error.
"We've decided that Polymorph and related effects don't work the way we hoped they would in play, and we've made the following changes:..."
That's not an error; what was published was what they meant to publish, but now they've made a change. Just like Feather Fall becoming an immediate action - that's not error correction, that's a change in the rules.
If the changes to Sunder and Lances and so forth are considered corrections of errors, then per the statement about free errata, they should appear in a downloadable document.
But if they were published as originally intended in the PHB, but they have decided some years later to revise the mechanics, those are not errata.
-Hyp.