Hi,
great news indeed!
Wiadomość napisana przez Ori Livneh <ori(a)wikimedia.org> w dniu 19 wrz 2014, o godz.
03:39:
You can enable HHVM by opting in to the beta feature.
This short animated
gif will show you how: <http://people.wikimedia.org/~ori/hhvm_beta.gif>.
The link to discussion on the experimental features page links to
https://www.mediawiki.org/wiki/Talk:HHVM/About instead
https://www.mediawiki.org/wiki/Talk:HHVM
Michał