It's 2.4x for both layers (I think the rumor that it would be faster for the first layer comes from the bad wording in first German press info from Philips). Other info about speeds and specs are available in the press release.
I would like to hear if Sony admits that the DRU-700A will be the same as Lite-On's DL writer and if Sony is involved in the R&D of the drive and in that case in what way (if he tells you that the drives are completely made by Sony tell him that you don't believe him )
And will they ship the drives with a DL media included in the package? Will it support bitsetting (I have a strong feeling that the answer is no).