Raspberry pi 4 announced

The Raspberry Pi Foundation has not announced any details of a Pi 4, and they generally do not pre-announce things, and asking for hints just annoys them. The tea leaves say that most of the changes that folks would want to see (USB3, more RAM, etc.) will require building an entirely new SoC (the chip that provides nearly all the functionality of the Pi: CPU, GPU, etc), and that task is neither cheap nor quick, so don't hold your breath.

What we do know: the CM3 just got released, and the Foundation is on record that a Pi 3A (effectively a Pi A+ with the Pi 3B's SoC) will be along "soon" after the CM3 (for unspecified values of "soon"). Anything beyond that is merely speculation.

The Pi 3B and Pi Zero are remarkable little machines - get one, or several, and enjoy making them do neat things now, and be happily surprised when the Pi 4 arrives someday. They are known to be i/o bandwidth limited, but can do some really interesting things.


Raspberry pi 4 (Not an announcement, No details!)

Speculation :: 

there will never be a Raspi 4.
Eben and Liz are going to retire to a life of luxury in Monaco on the profits of their venture. Very well deserved I might say.

Others will pick up the baton with a RISC V based machine.