I'm not good with links on kingsnake yet, but if you go to "Search Forums" towards the top of this page, and search the keywords " phantom burmese" (include the plus signs) it will bring up a post from around July. I think the pic at the very bottom of the post sounds similar to what you're describing.
Apparently the snake was originally called a co-dom Hypo Burmese, but they are now calling it a Platinum (I think all other known Burmese morphs are recessive). The super form of platinum is the beautiful baby Phantom in the other pics.
You can also do a google image search for "Indian python" (almost identical to Burms but lighter), and "ceylonese python" (the sri-lankan island form). Indian pythons are not as common in the U.S. as burms, but they're not that rare either.
Good luck,
kasey