I will wait for wpcentral to confirm and post an article , btw I am still using windows phone 8.1 on my lumia 920 (dev preview ). I am waiting for Nokia cyan update :wink:
Firmware update will include new drivers for windows phone 8.1 , tweaks and bug fixes for lumia devices , optimisations , support for new apps from Nokia :smile:
The Windows Phone 8.1 life cycle begins on June 24; that doesn't necessarily mean it will begin dropping that day. I can't imagine it'll be long after that, though.