I think there's a lot of interest in slotless magic lately. Kineticist has gone over well, there's been renewed focus on focus points as a key encounter resource, and we've even started to see more shifts towards feat-based abilities. It makes sense to me that they're exploring the different aesthetics for these mechanics.
Though I agree, runes in particular feels kind of out of place to me. The game already utilized runes as semi-permanent constructs. This feels like muddying the water a little bit.
Oh, he's not complaining anymore.