The logic board looks similar to the iPhone 5s, with one exception being that the top piece bracket is much longer than previous generations., indicating significant internal design changes. It has even been noted that this leaked logic board matches up perfectly with the rear shell/casing leaks we have already seen for the iPhone 6.
The source also claims that Apple's next generation iPhone 6 will be referenced internally as N61, and will feature NFC and 802.11ac Wi-Fi. We've already heard of rumors for both NFC and 802.11ac Wi-Fi, however we cannot confirm the existence of such features on the logic board from the photos that surfaced today.
As many of you know, Apple's iPhone 6 is rumored to launch in September and could feature both a 4.7-inch and 5.5-inch display.