I have been looking around, and I can't find any official informational update on the first Alpha release of Kubuntu Precise. Was Alpha 1 released?
A simple search of Kubuntu+Daily and Kubuntu+12.04+Aplha+1 on a random search engine gives you the answer:
It's a daily Image.
Alpha 1 was released 1 Dec. so it's Old and of no use now, daily images are newer. The next Alpha is to be released in Feb.
I have not seen an official release of Kubuntu 12.04 Alpha yet either nor have I seen an announcement.
FWIW I have been using the daily builds
The correct answer is there was no Alpha 1 release of Kubuntu for 12.04 Precise Pangolin. (I understand one of the key developers was in an accident.)
You could have downloaded a daily build, but now the Alpha 2 release is out.
Kubuntu release announcements
Looking the previous release announcements for the Kubuntu:
The Natty started from the Alpha 2: https://wiki.kubuntu.org/NattyNarwhal/Alpha2/Kubuntu
The Oneiric started from the Alpha 3: https://wiki.kubuntu.org/OneiricOcelot/Alpha3/Kubuntu
The KDE 4.8 Release Schedule: http://techbase.kde.org/Schedules/KDE4/4.8_Release_Schedule
The KDE 4.8 Feature Plan: http://techbase.kde.org/Schedules/KDE4/4.8_Feature_Plan
The Kubuntu (Ubuntu) Release Schedule : https://wiki.kubuntu.org/PrecisePangolin/ReleaseSchedule
Blueprints for (K)Ubuntu : https://blueprints.launchpad.net/ubuntu/+specs?searchtext=kubuntu
Ubuntu +1 (Precise Pangolin) : http://ubuntuforums.org/forumdisplay.php?f=412
Kubuntu 12.04 Precise Pangolin; Pre-Release Testing : http://www.kubuntuforums.net/forumdisplay.php?145-Pre-Release-Testing