Raspberry Pi 3 B+: Design
You will be sorely disappointed if you were expecting a radically different design to previous Raspberry Pis, as Raspberry Pi 3 B+ looks pretty similar to its predecessors.
Raspberry Pi 3 B+: Performance
While the design may not have changed much, the Pi's hardware did change a lot.Arguably the most significant change is that the processor has been improved. It's still a quad-core, 64-bit Broadcom chip paired with 1GB of LPDDR2 SDRAM, but it's now running with a clock speed of 1.4GHz, marking an increase of around 17% over the previous generation.
Raspberry Pi 3 B+: Networking
Aside from performance, the real meat of the changes for the Pi 3's mid-generation update is in the networking. The 3 B+ now supports Power over Ethernet (PoE) via a four-pin connector and a separate hat, which will be very useful for anyone seeking to use the Pi for IoT projects.
Raspberry Pi 3 B+: Verdict
On the surface, the creators of the Raspberry Pi haven't changed all that much with the Raspberry Pi 3 B+. PoE support is a nice addition and the RF shield will be useful for manufacturers, but the main improvements are a decent increase in speed and faster networking.
The Raspberry Pi 3 B+ is a $35 device that can act as a fully-functional desktop PC with few limitations.