Currently the D750 is £1600 new, like @Livin The Dream says the D810 replacement is likely to be £3k+. The biggest factor on price is going to be how well the value of the pound fairs, that's been the cause of price increases over the last year. This time last year the d750 was around £1385 UK new ones that at £1590. I honestly can't see a price drop happening the D750 when it's likely to be half the price of the replacement D810. Look at the new d7500 and older D7200 to see what's happened when a new model was introduced, no price drops by the looks of it.