Patek has its old base movements like 215, 324, 240, etc. They seem to be happy with these and naturally, developing new base movements would cost also something.
The base 215 is clearly too small for the modern watches. The automatic base movements 324 and 240 do not even have hacking seconds. Now when the sales are melting and the production has grown, we can just hope that Patek would come with something new which would also better justify the prices.
Many other manufacturers have been much more innovative during the past years.
Best, Kari