There are aftermarket cassete options for 12sp that will work on your 11sp HG freehub. You dont have to buy new wheels for that.
Yes, I realised that, I've gone with a Spedao lightweight 11-50t cassette which is 25% the price of an equivalent weight sram cassette. I'm still thinking of going XD on my road bike wheel in order to go down to a 10t cassette.
