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Drupal 7 preview

i installed latest development snapshot of Drupal 7. I found that a lot things have been changed. Whole core is rewritten with PHP 5.2 as base to utilize improvements done in language, like pdo, better timezone handling, etc and few important modules have been moved to core.
Database layer is rewritten using pdo, now it supports more databases.jquery ui is added to core. cck and jqury plugin manager is moved into core.
Seven is the new admin theme, it is single column theme. 1st september was expected to be release date of beta of Drupal 7 but there is a lot work still remain to do.

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