James has moved the explanatory page to Contributors/Projects/Accessible editing buttons, and started expanding it. I don't think he's done, but perhaps in another day or two.
I'd like to warn the Polish Wikipedians about this in advance. What do you think is the best page for that? The tech people will need to fix the scripts, so w:pl:Wikipedia:Kawiarenka/Kwestie techniczne would make sense, but non-tech editors need to know what's happening, so maybe it doesn't. Would you like to start telling people about this, or would you rather that I did (in English)?
Also, is there a particular day of the week that you prefer? I think that Wednesday or Thursday is feasible this week, but otherwise it will have to wait until next week. (Ops has officially disapproved of changes like this happening on Fridays/Saturdays/Sundays since the Orange Bar of Doom dispute when Echo was deployed to enwiki.)
- I have found some confetti. ;-)