Yeah I mean 825gb is quite small and I would have no trouble filling that up in a years time. £100 extra for 1.15tb is really good especially since we won't have to wait for a compatible 7GB/s NVMe drive, that will be more expensive coming from retail vendors.
Assuming there is a 2tb SKU. I would like to see a £499 base model and £599 2tb model. Of course the lower the better but yeah I don't think these consoles will come cheap.