Unexpected product from Raspberry Pi, Raspberry Pi announcement brings new excitement. This is no different. It's as exciting as any other Raspberry Pi new product.
The Raspberry Pi Pico is an entirely new type of microcontroller from Raspberry Pi. Small, cheap and flexible - it’s great for learning to code with MicroPython!
Whether you’re looking to learn about the MicroPython programming language, take your first steps in physical computing or want to build a hardware project, the Raspberry Pi Pico – and its amazing community – will support you every step of the way.

The Pico isn’t designed to replace the Raspberry Pi, which is a different class of device known as a single-board computer.

Whereas you might use your Raspberry Pi to play games, write stories and browse the web, your Raspberry Pi Pico is designed for physical computing projects where it can control familiar components such as LEDs, buttons, sensors, motors and even other microcontrollers.
The Pico can be quickly and easily programmed using MicroPython and C/C++ using popular editors such as Thonny. Getting started is also very easy thanks to the dedicated resources from Raspberry Pi.
You can program your Pico from your computer, a Raspberry Pi 4 or even another Raspberry Pi Pico!

Raspberry Pi Pico Specifications
The main chip on board is the 'RP2040' made by Raspberry Pi (their first in-house microcontroller chip!) and is a dual-core ARM Cortex M0+ processor, with a flexible clock running up to 133MHz.
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RP2040 microcontroller chip designed by Raspberry Pi in the United Kingdom
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Dual-core ARM Cortex M0+ processor, flexible clock running up to 133 MHz
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264kB of SRAM, and 2MB of onboard Flash memory
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Castellated module allows soldering directly to carrier boards
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USB 1.1 Host and Device support
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Low-power sleep and dormant modes
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Drag & drop programming using mass storage over USB
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26 multi-function GPIO pins
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2×SPI, 2×I2C, 2×UART, 3×12-bit ADC, 16×controllable PWM channels
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Real-time clock (RTC)
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Temperature sensor
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Accelerated floating-point libraries on-chip
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8×Programmable IO (PIO) state machines for custom peripheral support
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Dimensions: 51mm x 21mm (click for drawing)
Source: https://thepihut.com/collections/raspberry-pi-pico/products/raspberry-pi-pico