People need to get this idea of annual upgraded hardware releases out of their head. That works for the smartphone market b/c the overwhelming amount of people who upgrade their stuff do so on contract. The contract basically subsidizes the cost of the phone in the short term, even if it adds up in the long term.
Consoles do not have a subsidization model that works. Games are not a service to an extent that companies can use game sales or subscription revenue to offset hardware costs and thus get the majority of gamers on annual refresh cycles. In other words, the amount of users any company would be selling the new year's model to decreases for each additional year after the base system is sold, especially if the games are scalable across iterations, because only the hardcore gamers (who make up a small amount of total gamers) would continue buying them for incremental upgrades.
Most will wait out for the actual next-gen system. Sony, Microsoft and Nintendo know this, which is why that's the model they'll stick with until digital platform services is a reality in the next 10 years.
https://www.youtube.com/watch?v=ctYQ08gxkqA
what other consoles include bootup easter eggs?
You can outright skip the Saturn's boot up by holding the A, B, or C button after you turn it on. Works with each model.
That's the only other one I can think of atm.