Do i need to do something special to have external power to this board to the 5v pin and if i want to plug in a usb at the same time?

The board will use the 5VB power from the USB, so if you have the USB plugged in, you don't need to also provide separate 5V power.

Do I have enough room on this board to put a simple 3 image animation .gif (thumb nail size) with out the need to add a micro SD card?

There is plenty of room for that.

does this have keyboard and mouse HID support like the 3.6?

Currently, USB serial is the only supported USB device on Teensy 4.0. USB host is fully supported on Teensy 4.0 by the USBHost_t36 library, including keyboards and mice. PJRC is planning to add most of the USB device modes for Teensy 4.0 in the upcoming 1.49 software release. USB device mode optimizations are currently in beta testing, so progress is being made.

which pin set (spacing) do I need with this board?

The pins are standard 0.1 inch (2.54mm) spacing. Here is a link to the board's specs. The dimensional drawings are near the bottom of the page. https://www.pjrc.com/store/teensy40.html#specs

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Description

🚀 Power your innovation with the fastest microcontroller on the block!

COMPACT POWERHOUSE - Ultra-small 1.4 x 0.7 inch form factor fits anywhere without compromising performance.
VERSATILE CONNECTIVITY - Dual USB ports at 480 MBit/s and 3 CAN bus interfaces (including CAN FD) for seamless device integration.
BLAZING FAST PROCESSING - 600MHz NXP iMXRT1062 chip powers your most demanding projects with lightning speed.
FUTURE PROOF YOUR PROTOTYPES - Leverage cutting-edge ARM Cortex-M7 architecture to stay ahead in embedded development.
AMPLE MEMORY FOR COMPLEX TASKS - 1MB DDR4 RAM paired with 2MB flash storage ensures smooth multitasking and data handling.

The PJRC Teensy 4.0 Board is a compact, high-performance prototyping platform featuring a 600MHz ARM Cortex-M7 CPU, 1MB DDR4 RAM, and 2MB flash storage. Equipped with dual USB 2.0 ports and three CAN bus interfaces, it offers versatile connectivity for advanced embedded projects. Its tiny footprint and cutting-edge specs make it the go-to choice for professionals pushing the limits of microcontroller speed and integration.

Specifications

Brand	PJRC
Manufacturer	PJRC
Model	Teensy 4.0
Model Name	Teensy 4.0
Product Dimensions	3.81 x 1.27 x 1.27 cm; 10 g
Item model number	Teensy 4.0
RAM Size	1 MB
Memory Storage Capacity	2048 KB
Flash Memory Installed Size	2 MB
Flash memory type	sd
Ram Memory Installed Size	1 MB
Ram Memory Technology	DDR4
Computer Memory Type	EEPROM
Hard Drive Size	1 MB
Hard Drive Interface	ATA-4
Hard Disk Description	HDD
Optical Drive Type	BD-R
Operating System	DOS
Processor Brand	ARM
Processor Speed	600 MHz
Processor Type	Cortex
Processor Count	4
Hardware Interface	USB
Graphics Card Description	Integrated
Graphics RAM Type	EEPROM
Graphics Card Interface	Integrated
Resolution	3840 x 2160
Compatible Devices	Personal Computer
Mounting Hardware	1 x Board
Number of items	1
Power Source	Corded Electric
Batteries Included	No
Batteries Required	No
Wireless Type	802.11b
Connector Type	I2C, USB
Device interface - primary	Buttons
Form Factor	Stick
Has Auto Focus	No
Programmable Buttons	No
Manufacturer	PJRC
Country of Origin	China
Item Weight	10 g