Sony new model cycle is multi years, so there will not be a new model for awhile. If you are OK with waiting, then it will be a couple of years before there is a new model.
People look at the situation in different ways:
1. wait for the new model, as do not want to buy, and then a little while later, a new model is released. So should have waited.
CONS: feels like waiting forever, all the time, for every new model. And always feel that you got a bad deal, as should have waited for the next new model. And this becomes a habit, for all purchases.
2. buy and enjoy the current model. By the time a new model is released, will have gotten good use, and good value from the current one. Can wait for the new model to drop in price before considering buying.
3. wait for the new model, and let it age awhile, so that it drops in price. Wait until it is available on the 2nd hand market at 30-40% discount. Takes a little patience, but I think this is a better choice than option 1. It also needs the discipline to not rush out to buy the newest and greatest as soon as it is released, and instead always delay until the "latest and greatest" feeling has faded. And people are already chasing the next "latest and greatest".
This is slightly different from option 2, as there is a conscious decision to wait for price to drop, and the further discount of buying 2nd hand.
My vote would be to buy it now, and enjoy it.