I can't remember if double-XP also includes legacy points. Yesterday's patch never updated for me, even after running all night. There were some other people posting about it on the swtor forums. One common suggestion was to delete the "bitraider" folder then restart the launcher. That worked and it updated in just a few minutes this morning.
I'll probably take advantage of the double-xp week to work on my only toon that is still under 55. Since he's also my synthweaver, it would be nice to get him higher so he has a full compliment of companions to send out. He's level 26 at the moment.