I bought some NXT back in 2013 and left them in my wallet and forgot about them. Just installed the client 1.11.9 to find I also have some Ardor, and some other currency Cybershare or something like that. What other air drops are upcoming next year (and when), and is it OK to leave my NXT in this version of wallet?
Well, the wallet version doesn't matter - your coins are in the blockchain and not on your PC. So just make sure you always have your password saved and secure.
And yes, you'll get all the airdrops - so the IGNIS will go to you on the ARDOR blockchain. Meaning you'll have to login there (with the same password) once it is launched in Janurary.
Nxt holders will also receive Bitswift airdrops.
Be a bit careful with currencies/assets you get sent. Anyone can just send you anything, so scammers also try to send you stuff so you think it's official assets.