Well, I think I have found the solution. Reading the changelog from
bcmwl source in Launchpad I see for the Bionic package:

https://launchpad.net/ubuntu/+source/bcmwl

bcmwl (6.30.223.271+bdcom-0ubuntu4) bionic; urgency=medium

  * debian/dkms.conf.in, (LP: #1737744)
    debian/patches/0025-add-support-for-linux-4.14.patch:
    debian/patches/0026-add-support-for-linux-4.15.patch:
    - Add support for Linux 4.12.

 -- Marcelo Henrique Cerri <marcelo.ce...@canonical.com>  Fri, 15 Dec
2017 18:22:18 +0000

This is available since mid December, well ahead of the hwe edge push to
linux kernel 4.15.

Looking at the bcmwl source changelog for building package bcmwl-kernel-
source I don't see any support for kernel linux 4.15.

So what all users need is a backport from the Bionic 18.04 package,
waiting for this to happen as Seth Forshee suggested is plain non sense.
If the packages are not up to date it's only an Ubuntu decision not to
proceed with the update on depending packages.

I will rebuild the package for Xenial in one of my PPAs and report back
the result.

>From the beginning I was suspecting that the kernel linux 4.15 patches
were not applied, and it looks like it's the case. Now Xenial 16.04 LTS
is supposed to get an extended support, so may be if updated with new
linux kernels (availabe in official Ubuntu PPAs), Ubuntu should consider
upgrading depending packages and this one bcmwl-kernel-source is clearly
one.

The same goes for the nVidia Graphics Drivers, which are still
unsupported for Xenial 16.04 in linux kernel 4.15. I had to perform a
rebuild of nvidia-390 with the appropriate patches for dkms to work
properly.

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https://bugs.launchpad.net/bugs/1760108

Title:
  Broadcom B43 Wireless Driver Not Functional after Update to Linux
  Kernel 4.15

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