i guess its will be dash , bitcoin cash , ripple
I do not think Bitsler will ad bitcoin cash, as long as I know Bitsler does not support any HF coin so I think the chance is very low to see bitcoin cash here. We know 2 coins that will be added already, 1 more coin which is still a secret but I like to guess it and I hope it wont be an expensive coin like dash. So maybe ripple, NEM or Stellar.
Nowadays NEM price is really on high trend and this should be the chance for them to put it on their site but I still prefer to have ignis coin to be gambled away and to think that it drops under $1 then it should be considered as cheap coin so everyone can gamble and try to buy more coin. Stellar is pretty good coin too but still the progress is really slow on market