Got a chance to test this today. Unsurprisingly the Switch 2 won't dock with a OLED, Switch, or a couple of my third party docks though I didn't try all of them. It also seems to put the Nintendo docks into a weird state requiring a power cycle before they will work again. All of the docks charged some with Nintendo's charger and others with various USB PD chargers. The dock with ethernet did allow the Switch 2 to connect to the network.You buy a $450+ Switch 2 and be our test dummy then....make sure you try those 3rd party docks also.
More surprisingly, things didn't go the other way either. The OLED Switch would charge but not dock with the Switch 2 dock. I suppose we'll have to wait for third parties to give us a combination Switch/Switch 2 dock.








