The UAP guidelines for standard display ad units specify the format (300×250, 728×90 etc), ad name (leaderboard, med-rec etc) and max file weight (increased to 40kb which will be good news for creatives and flash developers), as well as ad creative due dates.

Click here for the UAP guidelines:

The rich media guidelines specify the format and category, maximum load file size, rich flash file size, video (polite download), flash specifics, audio initiation, maximum animation length and controls, as well as ad creative due dates.

The UAP also includes a listing of published specifications already provided by online publishers.