Not sure web editing is directly relevant to the FW43... It's a bit of a howler but updating corporate pages is not really a huge priority, especially as there are months to go before the season. Moreover, the team has not announced a reserve driver yet, so it could just be that they are waiting until they have all the drivers named before updating the site.
Well my prediction that the black-on-blue/white colour scheme would be carried over into this year might or might not be accurate, but RWR social media branding has changed from the black-white-red of last year to white-on-black. Furthermore, the Sofina logo used on the official announcement was white-on-black rather than the company's more usual dark blue-on-white, so is this an indication that we're looking at a white-on-black scheme for the FW43?
I'd be interested to know whether Williams is seriously moving into off-the-shelf parts for 2020. Obviously we know that they're going to keep making their own gearbox (which is absolutely the right move ahead of 2021, IF they're introducing a carbon 'box which they really should do) but there are a lot of smaller and less performance-related parts that could be bought off the shelf. This will save money and allow engineers to focus on areas that have a significant impact on performance. The example that's often given is the pedal box (I heard a story recently that Williams were doing some work on the F4 spec chassis and realised that the pedal box in that car was better than the bespoke one they were spending a fortune on creating) and there must be a lot of other components like this. The fly in that particular ointment might be Patrick Head, who was always one of the driving forces behind Williams engineering absolutely everything on the car. That said, he's strictly in a consultant role and my understanding is that it's more in the line of management processes and practices than anything more practical. But we'll see.