Google’s new quality score Improvements will soon be going live. Google will still consider account click through rate history, keywords and landing page quality. Here is an excerpt from the Google adwords blog:

• Quality Score is now more accurate — because it is calculated at the time of each search query
   
• Keywords are no longer marked ‘inactive for search‘ — all keywords are active because they are evaluated for every relevant query
   
• ‘First page bid estimates’ replace ‘minimum bids’ in your account — providing a more actionable and useful metric to advertisers