For those that don't have the first Transformers movie or know someone that doesn't, you might be interested in getting the Transformers Gift set. The cover art is to the left (via TFormers). The set will include both Transformers and Transformers: Revenge of the Fallen. The DVD set will be the regular edition with one disc for each movie while the Blu-ray edition will have four discs total (two for each movie).
I am assuming that the extras are the same as if you bought the movies separately (1-disc DVD or 2-disc Blu-ray), this is just packaged together to make a convenient gift to yourself or others. Going by Amazon's listing, the DVD and Blu-ray sets are expected to be released on October 20th along with Revenge of the Fallen’s release. If ordering from Amazon feel free to use the links above for a little credit to the site.