The iPhone 7 speaker ships with a leash stick-on Wi-Fi diversity antenna that connects to the logic board.

Waterproofing alert. The speaker's output duct fits over a rubber speaker grille gasket for an added layer of ingress protection.
This design is nigh identical to the one we unearthed in the iPhone 7 Plus a couple hours ago.
The duct also has a fine mesh in case the speaker grille doesn't do its water-blocking job.

The SIM eject tool ,pushes on a plastic pin, that pushes a metal pin, which in turn, ejects the SIM tray.

Apple added a rubber gasket around the SIM tray.

You can Now remove the logic board to take a closer look at some silicon.

If you look closely, you'll see minor differences in connector sizes and locations, post holes, and screw locations between the logic board of iphone 7 and 7 plus.
Logic board one side contains 

1.Apple A10 Fusion APL1W24 SoC + Samsung 2 GB LPDDR4 RAM (as denoted by the markings K3RG1G10CM-YGCH)
2.Qualcomm MDM9645M LTE Cat. 12 Modem

3.Skyworks 78100-20  Avago AFEM-8065 Power Amplifier Module Avago AFEM-8055 Power Amplifier Module

And on the flip side contains:

1.SK Hynix H23QEG8VG2ACS 32 GB Flash
2. Murata 339S00199 Wi Fi/Bluetooth Module
3. NXP 67V04 NFC ControllerDialog 338S00225 Power Management IC
4. Qualcomm PMD9645 Power Management IC
5. Qualcomm WTR4905 Multimode LTE Transceiver
6. Qualcomm WTR3925 RF Transceiver

Even more chips on logic board:

1. Bosch Sensortec BMP280
2. Barometric Pressure Sensor
3. Apple/Cirrus Logic 338S00105 Audio Codec
4. Cirrus Logic 338S00220 Audio  Amplifier(x2)
5. Lattice Semiconductor ICE5LP4K

6. Skyworks 13702-20 Diversity Receive Module
7. Skyworks 13703-21 Diversity Receive Module
8. Skyworks 77363-1

Remaining ICs On logic board

1. Avago LFI626 200157
2. NXP 610A38
3. TDK EPCOS D5315
4. Texas Instruments 62W8C7P
4. Texas Instruments 65730A0P Power Management IC
After logic board is out, its free to pick out the Lightning connector assembly.

Prying up the light adhesive went well, but our first tug was in vain. There are some extra screws in this port.
It seems like Apple has taken our warning to heart. Without a headphone jack to bear the burden of audio connections, this port will get a lot more wear, and it's been well reinforced.
Other denizens of the Lightning cable an antenna, two  microphones, two speaker grille plugs, and the Lightning port.

Scraping the bottom of the barrel phone case,  snag an antenna flex cable.

Also, a spidery mess of button cables. They're thin and fragile and tricky to remove intact, but they also snuggle up to a lot of waterproofed components. 

With the rear case nearly stripped, turn attention to the volume buttons that gave some trouble in the 7 Plus.

Persistent tugging with some tweezers rewards with a broken retaining flap, but this button cover still won't come quietly.
Next out is this weird c-clip looking thing.
And the button finally comes off, With two tiny gaskets, Apple is serious about this waterproofing.
This three-part mechanism is much more difficult to disassemble than the button covers, but hopefully the seal it provides means this removal procedure will be needed less frequently.

After some peeling, free the earpiece speaker and an all-new 7 MP FaceTime HD camera with deep trench isolation and auto image stabilization.

This is quite the upgrade from the 5MP FaceTime camera in the 6s.
The earpiece speaker is no slouch either, having been upgraded to serve as a second loudspeaker for legit stereo sound.
Also pluck out the solid state mini touch sensor, home "button."