The list of alleged part numbers was sent to AppleInsider and it reveals that 13 of them are accessories and 14 are Macs that are expected to be upgraded at the event.
Analyzing the code numbers of the document, the site writes that Time Capsule (code K31) will be updated and Apple can include new faster or higher capacity HDDs.
The D2 code name could be related to the new 15-inch MacBook Pros. The codes J31/J31 have been related to iMacs in the past, while J11/J13 may have to do with the MacBook Air.
The remaining codes are for accessories about which not much is known.
The Apple WWDC 2012 keynote will be held at 10 a.m. Pacific next Monday, June 11.