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The good news is that this week Freescale's iMX6 was freed - it can boot Android blob-free. It's not a widely popular SoC though, in terms of market share in phones and tablets.

He's talking BS.
Martin Graesslin, the KWin maintainer, began to prepare KWin for Wayland before Mir was even announced. So he designed the transition path to support two and only two back ends. See https://plus.google.com/115606635748721265446/posts/136nV4uojKH for details (public post, no need for a G+ account).

Graesslin also made it repeatedly clear that he won't support single-distro solutions. That means no support for MS Windows in KWin, OSX' Quartz, or Android's SurfaceFlinger. Somehow nobody ever had a problem with that decision. Only after Canonocal announced Mir Ubuntu fanboys began to whine.

There are no technological benefits for Mir over Wayland. Canonical made false claims as outlined on http://www.phoronix.com/scan.php?page=news_item&px=MTMxODA but they've since redacted the statements. Wayland even works with Android drivers: http://mer-project.blogspot.fi/2013/04/wayland-utilizing-android-gpu-drivers.html

The reasons for Mir are not technological, they are purely economical. Canonical wants to establish asymmetric licensing to have an economic advantage over the competition: http://mjg59.dreamwidth.org/25376.html
Wayland OTOH is under MIT/X11 license for everybody. This means that not only can any Linux vendor grab it and to anything with it, incl. to make an Android version that uses Wayland: http://ppaalanen.blogspot.com/2012/09/wayland-on-android-upgrade-to-404-and.html
Mir's licensing makes it forever impossible to become part of any major BSD variant. Wayland, however, is being ported to FreeBSD: http://www.phoronix.com/scan.php?page=news_item&px=MTMwMzE

Wayland is being pushed by industry giants such as Intel and Red Hat, as well as smaller companies like Collabora (creators of many technologies commonly used on GNU-based Linux such as Telepathy, WebKit-GTK, etc.: https://www.collabora.com/projects/ ).
Mir is just backed by Canonical who, while claiming to be the most popular Linux distributor, still makes no money: http://www.internetnews.com/blog/skerner/canonical-ubuntu-linux-is-still-not-profitable.html

Wayland's protocol and architecture allows it to serve X11 clients, through an emulated server. Improvements made to Weston as part of this engagement with the Raspberry Pi Foundation by Collabora enabled X11 applications to run seamlessly, running faster than under the legacy X.Org server.