[WikiEN-l] Usability testing ("Try Beta")

[Carcharoth]

I just noticed a new link appear next to the user page etc links at
top right (in monobook skin):

"Try Beta"

I haven't clicked it, but it seems to be a usability testing thing:

"Special:UsabilityInitiativeOptIn"

Anyone know what this is about, where it was announced, and where we
can read about it and discuss it?

I looked, but only found this, which was still interesting:

http://blog.wikimedia.org/2009/07/29/the-abcs-of-usability/

Carcharoth