AnandTech has written a review of the ASUS P5E3 Premium motherboard:
With Intel's X48 Express chipset launch less than one month away, ASUS has provided us with a near perfect sample of yet another great product for those looking to build their next ultimate overclocking system. Appropriately dubbed the "P5E3 Premium", this motherboard is much more than just a re-spin of their popular P5E3 Deluxe platform with the X48. The temptation for companies like ASUS to merely replace the X38 chipset with the pin-to-pin compatible X48 chipset and then remarket the board under a different name must be great. We would have a hard time giving a nod to the P5E3 Premium if this were the only change, especially to those that already own an X38 board. However, this is hardly the case. Simply looking over the board, we can find very few design layouts common to both the "Deluxe" and "Premium" variants of the P5E3. This is also reflected in the PCB revision silkscreened on the board, which has gone from 1.03G on the P5E3 Deluxe to 2.00G on the P5E3 Premium.
Check it out over here. The motherboard appears to be pretty good and got an editor's choice award.