I assume you already have read it on various other sources but just for completeness:
Quickr 8.1 English is available for download since today (or better since last night).
The planned eGA dates for the other languages will be:
* April 28 2008: West Europe
* May 12 2008: Nordic
* June 9 2008: Multilingual
* April 28 2008: Asia Pacific
Update:
Make sure you also download the following fixes from FixCentral:
* Required post-install fixes for Lotus Quickr 8.1 services for Lotus Domino (#1299067)
* Required post-install fixes for Lotus Quickr 8.1 services for WebSphere Portal (#1299060)
Quickr 8.1 English available