Even if you pay for Ring wallet now they won't be able to send them to customers for months, they plan to start shipping in the end of October, and that usually means in November or December.
Tangem doesn't show any information about source code so I guess it's going to be closed source, and I wouldn't waste my money on that.
https://tangem.com/en/ring/#ring-order
From their site:
So I would guess it's just the RFID and stuff from a card put into a ring. Can't see the firmware or software being any different.
The $160 price is a ring + 2 cards so more or less it's one of their 3 card sets but one of the cards is in a different format.
-Dave