Alleged 2019 iPhone XI logic board images shown in new leak
The images from an unnamed source have appeared on Slashleaks. This site recently also claimed to show a CAD render of the new 2019 iPhone.
Regardless of whether those CAD leaks are correct, it's not expected that Apple will introduce any major external changes to its new iPhone design —aside from a triple-lens camera bump. However, this new logic board leak suggests that much has been done internally to return to a more standard design.
The iPhone X, iPhone XS, and iPhone XR had boards small enough to enable the use of an L-shaped battery to maximize capacity, while this image suggests at least one of the new range will feature a straight rectangular board with less room to allow that to happen. That would mean that this particular upcoming iPhone will feature a design closer to that of the iPhone 8 and phones prior. A straight rectangle may also allow easier positioning of other internals.