2019 iPhone said to be sticking with Lightning, keep 5W charger
There are conflicting reports on if the 2019 iPhone will shift to USB-C or not, with the latest information suggesting that not only will Apple stick with Lightning, but it will also retain the same 5W charger in the box.

USB-C on the 13-inch MacBook Pro with Function Keys
Citing sources familiar with the matter, Macotakara is making the claim that Lightning will be retained. Reasons claimed are to keep costs down, as well as to prevent antagonizing customers and manufacturers with a shift to the newer connection method.
The information was obtained from a series of manufacturers who told the publication that the older Lightning would be retained.
For comparison's sake, the 30-pin connector was introduced on the third generation iPod in 2003, and ran for nine years until it was replaced in 2012. A shift to USB-C in the 2019 iPhone means that it would only be seven years between connector replacement.
The spec for USB-C was initially submitted in 2012, and published in early 2014. Apple's first product to incorporate the connector was the Retina MacBook, rolled out on April 10, 2015.
Apple link text with the release of the new iPad Pro lineup in late 2018. Rumors immediately started that the company would migrate the iPhone to the connector, with a resurgence of them in January.

USB-C on the 13-inch MacBook Pro with Function Keys
Citing sources familiar with the matter, Macotakara is making the claim that Lightning will be retained. Reasons claimed are to keep costs down, as well as to prevent antagonizing customers and manufacturers with a shift to the newer connection method.
The information was obtained from a series of manufacturers who told the publication that the older Lightning would be retained.
For comparison's sake, the 30-pin connector was introduced on the third generation iPod in 2003, and ran for nine years until it was replaced in 2012. A shift to USB-C in the 2019 iPhone means that it would only be seven years between connector replacement.
The spec for USB-C was initially submitted in 2012, and published in early 2014. Apple's first product to incorporate the connector was the Retina MacBook, rolled out on April 10, 2015.
Apple link text with the release of the new iPad Pro lineup in late 2018. Rumors immediately started that the company would migrate the iPhone to the connector, with a resurgence of them in January.
Comments
To 'keep costs down' - when 20W USB C fast chargers come by default now with mid-range Android phones?
Still, there's the wireless charging, maybe Apple considers connected-charging 'legacy' nowadays.
However for home use I installed combination wall outlets with AC and USB (2.1A/10W) outputs in the kitchen and bedroom. These work perfectly for overnight iPhone and iPad charging.
Fast charging is so good that you could have a coffee and top up while drinking it and get a lot more use out of the phone. In that situation the shackles are effectively taken off and the user doesn't have to worry so much about usage patterns.
I can understand why people would complain but generally you are charging overnight and fast charge is completely unnecessary.
That being said, if you forget to plug-in before bed, you are put in a spot where a fast charge option would be nice in some situations.
Most vehicles have a USB-A port in them now and you can keep a cable in there to charge on your commute or most people have an extra cable at the office or carry a power bank.
I can see both sides of the argument but generally people do not need fast charge.
See my comments above. I have Lightning cables everywhere, and it seems like I only just recently got rid of the last of my 30-pin Dock Connector cables, and finally have enough Lightning cables to meet my needs. To say nothing of Lightning adapters, and Lightning accessories I’ve purchased. So I’m not really sure how Apple switching to USB-C on the iPhone is going to help me. If anything, I’m going to have to buy all new cables, and accessories. With an iPhone 8, I can have a wireless charger at home, and can use them at airports and coffee houses. And if I need to borrow, or buy a cable because I left mine at home, I can go to any 7-11 and buy one 24 hours a day. I work on an office campus of 5,000 people and I would be hard pressed to find one USB-C cable, where’s about 70% of those in my office have Lightning cables.
apple should leave the Lightning port alone in the iPhone, and let people move to Qi, which is fast becoming a more common standard than USB-C in public spaces, not to mention more convenient.