Its between a rock and a hard place for manufacturers.
Don't increase mp count, will end up looking as lacking to layman and potential customers when competitors move up in mp.
Move up, and processing power needs to be increased; file storage issues; maybe noise too (but everybody said that for the 16mp sensor now on K5, NEX-5n, D7k, A580 and were largely proven wrong)
The only example from this new 24mp sensor is from A77, and the Axx series has always looked worse at high ISO vs mirrored counterparts using the same sensor.
Lets hope the K? will be to of its class again like K5 was.
However, 24mp is really approaching the point of lunacy for me as a hobbyist. I need to print lots of A1 and A0 or crop a lot to really need it. Not to mention a new computer.