They might not processed it just yet. Cancel if you can and order the new base model. Same price bigger and faster storage. Or bit more for nice oled and better battery.

Maybe fine, short operating hours. Phones not getting that much burn-in either. But good to take care yes. If solid 30-40-60Fps no dips better to turn it off

Most likey, they will ship new decks with 3.5 yes. But they taking pre-orders? Or ship within 1-2 weeks?

If arriving in short notice might we see 3.5 on Stable channel within a week or so.