It isn't based on Intel's latest, but if you're looking to grab an "older" X48 but still don't want to part with your DDRs, this board from Gigabyte may be for you.

The Gigabyte X48-DQ6 Motherboard is interesting not because it's a X48 board, but because it's a X48 with DDR2 support. The Gigabyte X48 board itself isn't that cheap, but the cost of the platform should be less than other X48 motherboards since DDR2 is still al ittle cheaper than DDR3. That, or if you got a stock pile of DDR2, you don't need to throw it out. From an engineering standpoint, this was also a no brainer since the X48-DQ6 design mirrors their own X38 board so a simple chipset swap was all they needed to do at a fab level.