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There are several new features available for Raspberry passionates.
More CPU Power
The new Broadcom BCM2711, Quad core Cortex-A72 (ARM v8) 64-bit SoC @ 1.5GHz assures more power to the new board, in comparison to the previous Broadcom BCM2837B0 quad-core A53 (ARMv8) 64-bit @ 1.4GHz.
The A72 processor is more focused on performances, even if it runs at a similar frequency than the A53. On the other hand, it is less energy efficient. So the quality of power supply now can have more influence on Pi work.
For a complete comparison, please refer to this simple and accurate article.
RPI 4 uses LPDDR4-2400 SDRAM instead of RPI 3 LPDDR2 SDRAM. This brings higher peak throughput which is useful for memory hungry applications. The new RPI4 presents also a news on memory: you can buy the board in 3 different memory configurations (1GB, 2GB and 4GB), which permit users to choose the one that best fits its needs.
An accurate comparison between the LPDDR2 and LPDDR4 RAM can be found here.
Similarly to its brother, Raspberry Pi 4 comes with Gigabit Ethernet, along with onboard wireless networking and Bluetooth. The previous Bluetooth 4.2 (Bluetooth Low Energy (BLE)) has been upgraded with a Bluetooth 5.0 (BLE) connection.
The new Raspberry Pi 4 has upgraded USB capacity: the two USB 3.0 ports can assure data transfer faster than previous model. Behind this, there are also two USB 2.0 ports assuring the 4 USB interfaces. The previous board has only 4x USB 2.0 ports.
Raspberry Pi 4 maintains standard 40 pin GPIO header (fully backwards compatible with previous boards).
Also camera connection is still present, to allow projects including videosurveillance, videoconferencing, etc.
RPI 4 also includes a surprise regarding HDMI: this model includes 2 Micro HDMI ports, supporting up to 2x 4k displays. This can be a real advantage for those people wanting to extend a desktop environment to a second display or to realize a fantastic Media Center.
The new board seems to be focused to performances, not only to improve power for DIY projects but also to become something nearer a Personal Computer. The Raspberry Pi Foundation announcement can be found here.
Hope to be able to test it as soon as possible for deeper thinks.